/* ================================
   Modern Pro Styles
   ================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* ── ANIMATION STANDARD ─────────────────────────────────────
   Two categories — different rules for each:

   STATE animations (hover, focus, micro-interactions): max 160ms, ease.
   PRESENCE animations (hero, avatar reveal, streaming, card entrance,
   spatial transitions): no hard cap — purposeful, weighted, intentional.

   The rule is: no frívolo. No bouncing, no spinning, no decoration
   without intent. Slowness is allowed when it carries meaning.

   Accent color: :hover/:focus/:active + active streaming/spatial states.
   Exception: panel slide (200ms) intentional from EP0006 — untouched.
   ────────────────────────────────────────────────────────── */

:root {
    /* ── DESIGN TOKENS — canonical --color-* system ── */
    --color-bg:           #0D1117;
    --color-bg-elevated:  #111115;
    --color-bg-card:      #111115;
    --color-bg-card-hover:#16161b;
    --color-surface:      #13131a;

    --color-primary:      #8888A8;
    --color-secondary:    #9A9AA1;
    --color-accent:       #8888A8;

    --color-text:           #EDEDED;
    --color-text-secondary: #9A9AA1;
    --color-text-muted:     #8C8C96; /* raised from #6b6b72 to pass WCAG AA (UI-04) */

    --color-border:       #1A1A1F;
    --color-border-hover: #2a2a35;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error:   #ef4444;

    /* Typography */
    --font-family: 'Fira Code', 'Courier New', monospace;
    --line-height:    1.5;
    --letter-spacing: -0.01em;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows — use solid rgba only, no colored glow */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);

    /* Transitions — all ≤ 160ms, ease easing */
    --transition-speed: 160ms;
    --easing:           ease;
    --ease-out:         ease;
    --duration-fast:    120ms;
    --duration-normal:  160ms;

    /* Spatial UI — timing */
    --dur-spatial:     600ms;
    --dur-spatial-rev: 450ms;
    --ease-spatial:    cubic-bezier(0.22, 1, 0.36, 1);
    --ease-overshoot:  cubic-bezier(0.16, 1, 0.3, 1);

    /* Spatial UI — glass tint base
       The underlying hue of every glass surface: deep blue-indigo.
       Use --glass-tint-rgb to compose new surfaces: rgba(var(--glass-tint-rgb), <opacity>)
       Use --glass-frost-* for white-light internal borders and drag surfaces. */
    --glass-tint-rgb:      18, 20, 42;
    --glass-frost-subtle:  rgba(255, 255, 255, 0.025);
    --glass-frost-dim:     rgba(255, 255, 255, 0.05);

    /* Spatial UI — glass layers (each layer more opaque than the last)
       Layer 0: void (body gradient — has depth for blur to work)
       Layer 1: panel (content area — translucent, tinted)
       Layer 2: cards (glass-on-glass — visible surface)
       Layer 3: chat float (most opaque — solid, premium, readable) */
    --glass-panel-bg:      rgba(15, 18, 35, 0.55);
    --glass-panel-blur:    blur(40px);
    --glass-card-bg:       rgba(25, 28, 50, 0.50);
    --glass-card-blur:     blur(16px);
    --glass-float-bg:      rgba(12, 14, 24, 0.92);
    --glass-float-blur:    blur(24px);
    --glass-border:        1px solid rgba(255, 255, 255, 0.08);
    --glass-border-hover:  1px solid rgba(255, 255, 255, 0.15);
    --glass-border-strong: 1px solid rgba(255, 255, 255, 0.11);

    /* Tinted glass borders — indigo-periwinkle, visible against dark backgrounds.
       Use for panel edges and card outlines where definition is needed. */
    --glass-border-tint:       1px solid rgba(88, 98, 195, 0.28);
    --glass-border-tint-hover: 1px solid rgba(110, 122, 220, 0.42);

    /* Spatial UI — shadows + glow */
    --shadow-glass:     0 0 0 1px rgba(255, 255, 255, 0.03), 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-float:     0 0 0 1px rgba(255, 255, 255, 0.06),
                        0 24px 80px rgba(0, 0, 0, 0.7),
                        0 0 1px 0 rgba(136, 136, 168, 0.15);
    --shadow-card:      0 0 0 1px rgba(255, 255, 255, 0.04),
                        0 4px 20px rgba(0, 0, 0, 0.4);
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    font-size: 15px;
    line-height: var(--line-height);
    letter-spacing: var(--letter-spacing);
    color: var(--color-text);
    background:
        radial-gradient(ellipse at 20% 10%, rgba(40, 30, 70, 0.45) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 85%, rgba(15, 35, 65, 0.35) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(20, 18, 35, 0.3) 0%, transparent 70%),
        #0A0C14;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background 1.2s ease;
}

/* Breathing — inhale on send (anticipation), exhale on response (release) */
body.bg-inhale {
    background:
        radial-gradient(ellipse at 20% 10%, rgba(65, 45, 105, 0.70) 0%, transparent 52%),
        radial-gradient(ellipse at 85% 85%, rgba(20, 48, 88, 0.55) 0%, transparent 48%),
        radial-gradient(ellipse at 50% 50%, rgba(32, 26, 56, 0.50) 0%, transparent 65%),
        #060810;
    transition: background 0.5s ease;
}
body.bg-exhale {
    background:
        radial-gradient(ellipse at 20% 10%, rgba(40, 30, 70, 0.45) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 85%, rgba(15, 35, 65, 0.35) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(20, 18, 35, 0.3) 0%, transparent 70%),
        #0A0C14;
    transition: background 2.5s ease;
}

/* Estado B — content panel active: right side of background intensifies */
body.bg-active {
    background:
        radial-gradient(ellipse at 20% 10%, rgba(40, 30, 70, 0.45) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 30%, rgba(60, 50, 140, 0.25) 0%, transparent 45%),
        radial-gradient(ellipse at 75% 80%, rgba(20, 45, 90, 0.40) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(20, 18, 35, 0.3) 0%, transparent 70%),
        #0A0C14;
    transition: background 1.2s ease;
}

/* Atmospheric gradient removed — flat background only (US0027) */

/* ================================
   App Container
   ================================ */
.app {
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden; /* fallback */
    overflow: clip;   /* doesn't trap position:fixed children */
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

/* ================================
   Header
   ================================ */
.app-header {
    padding: 64px 0 0 80px;
    text-align: left;
    flex-shrink: 0;
    border-bottom: none;
    transition: padding var(--duration-normal) var(--ease-out);
}

.profile {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
}

.avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transition: all var(--duration-normal) var(--ease-out);
}

.avatar:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}


.lang-toggle {
    color: var(--color-text-secondary);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: var(--space-1) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-surface);
    /* backdrop-filter removed (US0027) */
    cursor: pointer;
    transition: all var(--duration-normal) var(--ease-out);
    font-family: var(--font-family);
}

.lang-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-secondary);
    background: var(--color-bg-card);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}


/* ================================
   Main Content
   ================================ */
.main-content {
    flex: 1;
    display: flex;
    overflow: hidden; /* fallback for browsers without clip support */
    overflow: clip;   /* clip does NOT create a containing block — position:fixed escapes correctly */
    position: relative;
}

/* Default: chat centered */
.main-content:not(.split) {
    justify-content: center;
    padding: 0 var(--space-4);
}

.main-content:not(.split) .chat-panel {
    max-width: 520px;
    width: 100%;
}


/* ================================
   Chat Panel
   ================================ */
.chat-panel {
    display: flex;
    flex-direction: column;
    padding: var(--space-4);
    height: 100%;
    /* Critical: prevent panel from growing beyond its allocated height.
       Without this, if height:100% doesn't resolve (iOS Safari edge case),
       the panel falls back to height:auto and grows with content, pushing
       the form below the viewport and breaking scroll entirely. */
    overflow: hidden;
    transition: flex-basis 640ms cubic-bezier(0.16, 1, 0.3, 1),
                max-width   640ms cubic-bezier(0.16, 1, 0.3, 1),
                padding     var(--dur-spatial) var(--ease-spatial);
}


.chat-messages {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch; /* momentum scroll on older iOS */
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    min-height: 0;
    padding-right: var(--space-2);

    /* Custom scrollbar */
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

/* US0028: Desktop reading column — default (non-split) mode only */
/* Welcome message */
.welcome-message {
    text-align: center;
    padding: var(--space-12) var(--space-4);
    animation: fadeInUp 0.8s var(--ease-out);
}

.welcome-message p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.welcome-message.hidden {
    display: none;
}

.welcome-message.fade-out {
    animation: fadeOut 300ms var(--ease-out) forwards;
    pointer-events: none;
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(-12px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Messages — US0028: no bubbles, plain text, left-aligned */
.message {
    max-width: 100%;
    padding: 0;
    border-radius: 0;
    line-height: var(--line-height);
    letter-spacing: var(--letter-spacing);
    animation: messageIn 0.4s var(--ease-out);
    position: relative;
    color: var(--color-text);
    text-align: left;
    align-self: stretch;
}

@keyframes messageIn {
    from {
        opacity: 0;
        transform: translateY(15px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message.user {
    font-size: 1rem;      /* 16px */
    font-weight: 400;
    margin-bottom: 24px;
    color: var(--color-text-secondary);
}

.message.assistant {
    font-size: 1.125rem;  /* 18px */
    font-weight: 400;
    margin-bottom: 32px;
}

/* Paragraph gaps within assistant message */
.message.assistant p + p {
    margin-top: 12px;
}

/* AO-01: inline markdown elements */
.message.assistant strong { font-weight: 600; color: var(--color-text); }
.message.assistant em     { font-style: italic; color: var(--color-text-secondary); }
.message.assistant code   {
    font-family: var(--font-family);
    font-size: 0.88em;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 1px 5px;
    color: var(--color-text-secondary);
}

/* ── Assistant messages: volumetric entrance (presence animation) ──
   User messages stay flat — they're input, not presence.
   Perspective in transform() is local — no parent change needed, no reflow. */
.message.assistant {
    animation: assistantIn 640ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes assistantIn {
    0%   { opacity: 0; transform: perspective(900px) rotateX(-6deg) translateY(14px) scale(0.98); }
    60%  { opacity: 1; }
    100% { opacity: 1; transform: perspective(900px) rotateX(0deg)  translateY(0)    scale(1);    }
}

.message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-error);
    align-self: flex-start;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.error-retry-btn {
    align-self: flex-start;
    background: none;
    border: 1px solid rgba(239, 68, 68, 0.4);
    border-radius: var(--radius-full);
    color: var(--color-error);
    cursor: pointer;
    font-family: var(--font-family);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    padding: 3px 10px;
    text-transform: uppercase;
    transition: background var(--duration-normal) var(--ease-out);
}
.error-retry-btn:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* Loading */
.message.loading {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    align-self: flex-start;
    padding: var(--space-4);
}

/* Typing indicator */
#thinking-indicator {
    display: none;
    align-items: center;
    align-self: flex-start;
    width: max-content;
    padding: var(--space-2) var(--space-3);
    background: var(--color-surface);
    border-radius: 16px 16px 16px 4px;
    margin: var(--space-1) 0 var(--space-8);
}

.typing-label {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    text-align: left;
}

/* ── Accent activation: presence moments ────────────────────────
   Accent surfaces when César is active — not on every hover.
   Two states: loading (thinking) + avatar has-bubble (contact).
   ─────────────────────────────────────────────────────────────── */

/* Loading state — input border warms to accent while César thinks */
body.bg-inhale .chat-form textarea {
    border-bottom-color: var(--color-accent);
    transition: border-color 0.5s ease;
}

/* Loading state — thinking indicator gets a faint accent presence */
body.bg-inhale #thinking-indicator {
    background: rgba(136, 136, 168, 0.07);
    border: 1px solid rgba(136, 136, 168, 0.16);
    transition: background 0.5s ease, border-color 0.5s ease;
}

body.bg-inhale .typing-label {
    color: var(--color-accent);
    transition: color 0.5s ease;
}


/* ================================
   Chat Form
   ================================ */
.chat-form {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding-top: var(--space-4);
    flex-shrink: 0;
    position: relative;
    z-index: 200;
    transition: padding var(--dur-spatial) var(--ease-spatial),
                background var(--dur-spatial) var(--ease-spatial);
}


.char-counter {
    position: absolute;
    right: 56px;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
}
.char-counter:not(:empty) { opacity: 1; }
.char-counter--warn { color: var(--color-warning, #f59e0b); }
.char-counter--over { color: var(--color-error, #ef4444); font-weight: 600; }

/* US0029: Input — auto-expanding textarea */
.chat-form textarea {
    flex: 1;
    min-height: 44px;
    max-height: 120px;
    padding: var(--space-3) 0 var(--space-2) 0;
    border: none;
    border-bottom: 1px solid var(--color-text-secondary);
    border-radius: 0;
    font-size: 1rem;
    font-family: var(--font-family);
    font-weight: 400;
    background: transparent;
    color: var(--color-text);
    outline: none;
    cursor: text;
    resize: none;
    overflow-y: hidden;
    line-height: 1.5;
    transition: border-color var(--transition-speed) var(--easing);
}

/* When placeholder is visible (input empty), expand to show full placeholder text */
.chat-form textarea:placeholder-shown {
    min-height: 64px;
    overflow-y: hidden;
}

.chat-form textarea:focus {
    border-bottom-color: var(--color-accent);
}

.chat-form textarea.submit-glow {
    border-bottom-color: var(--color-text);
    box-shadow: 0 1px 0 0 rgba(237, 237, 237, 0.4);
}

.chat-form textarea::placeholder {
    color: #BEBEC8;
    transition: opacity var(--transition-speed) var(--easing);
}

.chat-form textarea:focus::placeholder {
    opacity: 0.6;
}

/* US0029: Send button hidden on desktop — Enter key submits */
.send-button {
    display: none;
}

@media (max-width: 1023px) {
    .send-button {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 28px;
        flex-shrink: 0;
        background: none;
        border: 1.5px solid var(--color-border);
        border-bottom-width: 3px;
        border-radius: 5px;
        color: var(--color-text-secondary);
        cursor: pointer;
        padding: 0;
        font-family: var(--font-family);
        font-size: 0.95rem;
        transition: color var(--duration-normal) var(--ease-out),
                    border-color var(--duration-normal) var(--ease-out);
        align-self: flex-end;
        margin-bottom: 8px;
    }

    .send-button:active {
        color: var(--color-text);
        border-color: var(--color-border-hover);
        transform: translateY(1px);
        border-bottom-width: 2px;
    }
}


/* R-12: Stop streaming button — shown during active stream on all viewports */
.stop-button {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 28px;
    flex-shrink: 0;
    background: none;
    border: 1.5px solid var(--color-border);
    border-bottom-width: 3px;
    border-radius: 5px;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 0;
    font-size: 0.75rem;
    align-self: flex-end;
    margin-bottom: 8px;
}
.stop-button:active {
    transform: translateY(1px);
    border-bottom-width: 2px;
}

/* US0029: Avatar — bottom-right, revealed after first message */
#cesar-avatar {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    opacity: 0;
    object-fit: cover;
    cursor: default;
    border: 2px solid rgba(255, 255, 255, 0.10);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    transition: opacity 200ms ease, filter var(--transition-speed) var(--easing);
    pointer-events: none;
}

#cesar-avatar.visible {
    opacity: 0.9;
    pointer-events: auto;
    z-index: 200;
}

#cesar-avatar.visible:hover {
    filter: brightness(1.02);
}



.tech-chip {
    font-size: 0.65rem;
    font-weight: 500;
    padding: 4px var(--space-3);
    background: rgba(255, 255, 255, 0.04);
    color: var(--color-text-secondary);
    border-radius: var(--radius-full);
    border: 1px solid rgba(255, 255, 255, 0.06);
    letter-spacing: 0.02em;
    transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.tech-chip:hover {
    border-color: rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.07);
    color: var(--color-text);
}

/* ================================
   Detail View — Spatial UI: cover layout
   ================================ */
.detail-view {
    display: flex;
    flex-direction: column;
    gap: var(--space-10);
    padding-bottom: var(--space-8);
}

/* Staggered section entrance */
.detail-view > * {
    animation: detailSectionIn 400ms var(--ease-overshoot) both;
}
.detail-view > :nth-child(1) { animation-delay: 0ms; }
.detail-view > :nth-child(2) { animation-delay: 80ms; }
.detail-view > :nth-child(3) { animation-delay: 160ms; }
.detail-view > :nth-child(4) { animation-delay: 240ms; }
.detail-view > :nth-child(5) { animation-delay: 320ms; }
.detail-view > :nth-child(6) { animation-delay: 400ms; }

@keyframes detailSectionIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.detail-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding-bottom: var(--space-6);
    border-bottom: var(--glass-border);
}

.detail-type {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
}

.detail-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

.detail-tagline {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    font-style: italic;
    line-height: 1.5;
}

.detail-description {
    font-size: 0.92rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.detail-highlights {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.detail-highlights li {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    padding-left: var(--space-4);
    position: relative;
}

.detail-highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-text-secondary);
    font-size: 0.8rem;
}

.detail-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding-top: var(--space-6);
    border-top: var(--glass-border);
}


/* ── Substack embed container ──────────────────────────────── */
.detail-view.detail-view--article {
    max-width: 480px;
    margin: 0 auto;
    width: 100%;
}

.detail-view .substack-post-embed {
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.detail-section-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: none;
    letter-spacing: 0.02em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-2);
}

.detail-tech {
    display: flex;
    flex-direction: column;
}

.tech-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.detail-links {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding-top: var(--space-2);
}

.detail-link {
    display: inline-flex;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 200ms var(--ease-spatial);
}

.detail-link.primary-link {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text);
    border: var(--glass-border-strong);
    box-shadow: var(--shadow-card);
}

.detail-link.primary-link:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.09);
    border-color: rgba(255, 255, 255, 0.16);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ================================
   Responsive - Mobile
   ================================ */
@media (max-width: 768px) {
    /* Input: 16px prevents iOS auto-zoom */
    .chat-form textarea {
        font-size: 1rem;
    }

    /* Chat form: visual breathing room — safe area handled at .app level */
    .chat-form {
        padding-bottom: var(--space-2);
    }
}

/* ================================
   Accessibility
   ================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0ms !important;
        animation-duration: 0ms !important;
        animation-iteration-count: 1 !important;
    }
}

@media (prefers-contrast: high) {
    :root {
        --color-border: rgba(255, 255, 255, 0.3);
        --color-text-secondary: #d4d4d8;
    }
}

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--color-accent);
    color: var(--color-text);
}

/* ================================
   US0030: Mobile Polish
   ================================ */
@media (max-width: 767px) {
    /* Reading column: 28px padding (vs 120px desktop) */
    .chat-messages {
        padding-left: 28px;
        padding-right: 28px;
        padding-top: 12px;
        padding-bottom: 80px;
    }

    .chat-messages .message {
        max-width: 100%;
    }

    /* Chat form: flush with side padding */
    .chat-form {
        padding-left: 28px;
        padding-right: 28px;
    }

}


/* ═══════════════════════════════════════════════════════════
   HERO REDESIGN — state overrides + new layout rules
   ═══════════════════════════════════════════════════════════ */

/* Compact header — moves inside chat-messages on first message */
.app-header.compact {
    padding: 0 0 var(--space-10) 0;
    border-bottom: none;
    flex-shrink: 0;
}

.app-header.compact .hero-name {
    display: none;
}


.app-header.compact .hero-headline {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: var(--letter-spacing);
    color: var(--color-text);
    opacity: 1;
    transition: font-size var(--duration-normal) var(--ease-out),
                opacity var(--duration-normal) var(--ease-out);
}

/* Hero headline */
.hero-headline {
    font-size: clamp(1.75rem, 3.5vw, 3.25rem);
    font-weight: 450;
    color: var(--color-text);
    line-height: 1.25;
    letter-spacing: -0.03em;
    max-width: 100%;
    transition: font-size var(--dur-spatial) var(--ease-spatial),
                opacity var(--dur-spatial) var(--ease-spatial),
                line-height var(--dur-spatial) var(--ease-spatial),
                font-weight var(--dur-spatial) var(--ease-spatial),
                letter-spacing var(--dur-spatial) var(--ease-spatial);
}

@media (max-width: 768px) {
    .hero-headline {
        font-size: clamp(1.35rem, 5.5vw, 1.75rem);
    }
}

/* Hero name / attribution */
.hero-name {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.01em;
    opacity: 1;
    transform: translateY(0);
    transition: font-size var(--dur-spatial) var(--ease-spatial),
                opacity var(--dur-spatial) var(--ease-spatial),
                transform var(--dur-spatial) var(--ease-spatial);
}


/* Typewriter cursor */
.type-cursor {
    display: inline-block;
    color: var(--color-text-secondary);
    font-weight: 300;
    animation: type-blink 1s step-end infinite;
    margin-left: 1px;
}

@keyframes type-blink {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0; }
}


/* Hide lang-toggle except in split mode (keep bilingual accessible) */
.lang-toggle {
    display: none;
}

/* ── Main content: full-width, left-aligned ── */
.main-content:not(.split) {
    justify-content: flex-start;
    padding: 0;
}

.main-content:not(.split) .chat-panel {
    max-width: none;
    width: 100%;
}

/* ── Chat panel: zero base padding, each child controls its own ── */
.chat-panel {
    padding: 0;
}

/* ── Desktop: 80px left rail ── */
@media (min-width: 1024px) {
    .main-content:not(.split) .chat-messages {
        padding-left: 80px;
        padding-top: 48px;
        padding-bottom: 80px;
        padding-right: 24px;
    }

    .main-content:not(.split) .chat-messages .message {
        max-width: 680px;
    }

    .main-content:not(.split) .chat-form {
        padding-left: 80px;
        padding-right: 24px;
        padding-bottom: 48px;
        padding-top: 0;
    }
}

/* ── Mobile: 24px margin ── */
@media (max-width: 1023px) {
    .app-header {
        padding: 28px 0 0 20px;
    }

    .app-header.compact {
        padding: 0 0 var(--space-5) 0;
    }

    /* Avatar + contact bubble: hidden on mobile (socials move to compact header) */
    #cesar-avatar,
    #contact-bubble {
        display: none !important;
    }


    .main-content:not(.split) .chat-messages {
        padding-left: 20px;
        padding-right: 20px;
        padding-top: 20px;
        padding-bottom: 80px;
    }

    /* Thinking indicator inherits left position from chat-messages padding */
    .main-content:not(.split) #thinking-indicator {
        padding-left: 0;
    }

    .main-content:not(.split) .chat-form {
        padding-left: 20px;
        padding-right: 20px;
        padding-bottom: max(20px, env(safe-area-inset-bottom));
        padding-top: 0;
    }
}

/* ── Avatar: hidden until JS adds .visible post-primer-mensaje ── */
#cesar-avatar.has-bubble {
    cursor: pointer;
    border-color: var(--color-accent);
    opacity: 1;
}

/* ── Avatar ping — one-shot ring on reveal ── */
@keyframes avatarPing {
    0%   { transform: scale(1);   opacity: 0.5; }
    100% { transform: scale(1.9); opacity: 0;   }
}

#cesar-avatar::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    border: 1.5px solid var(--color-accent);
    opacity: 0;
    pointer-events: none;
}

#cesar-avatar.ping::after {
    animation: avatarPing 700ms ease-out forwards;
}

/* Spatial UI: breathing ring before content emerges */
@keyframes avatarBreathe {
    0%, 100% { transform: scale(1);   opacity: 0.3; }
    50%      { transform: scale(1.3); opacity: 0.15; }
}

#cesar-avatar.breathing::after {
    opacity: 0.3;
    animation: avatarBreathe 1.2s ease-in-out 2;
}

/* Spatial UI: absorb pulse when content returns */
@keyframes avatarAbsorb {
    0%   { transform: scale(1.4); opacity: 0.4; }
    100% { transform: scale(1);   opacity: 0; }
}

#cesar-avatar.absorb::after {
    animation: avatarAbsorb 400ms ease-out forwards;
}

/* ── Contact card — rises from avatar ── */
.contact-bubble {
    position: fixed;
    bottom: 116px;
    right: 32px;
    z-index: 200;
    pointer-events: none;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 200ms ease, transform 200ms ease;
    min-width: 180px;
}

.contact-bubble.visible {
    pointer-events: auto;
    opacity: 1;
    transform: translateY(0);
}

.contact-bubble-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3) 0;
    display: flex;
    flex-direction: column;
}

.contact-bubble-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 16px;
    text-decoration: none;
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: 0.82rem;
    transition: background 120ms ease, color 120ms ease;
    opacity: 0;
}

.contact-bubble.visible .contact-bubble-item {
    animation: bubbleItemIn 180ms ease forwards;
}

.contact-bubble.visible .contact-bubble-item:nth-child(1) { animation-delay: 40ms; }
.contact-bubble.visible .contact-bubble-item:nth-child(2) { animation-delay: 90ms; }
.contact-bubble.visible .contact-bubble-item:nth-child(3) { animation-delay: 140ms; }
.contact-bubble.visible .contact-bubble-item:nth-child(4) { animation-delay: 190ms; }

@keyframes bubbleItemIn {
    from { opacity: 0; transform: translateX(6px); }
    to   { opacity: 1; transform: translateX(0); }
}

.contact-bubble-item:hover {
    background: var(--color-bg-card);
    color: var(--color-text);
}

.contact-bubble-abbr {
    width: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    flex-shrink: 0;
    transition: color 120ms ease;
}

.contact-bubble-item:hover .contact-bubble-abbr {
    color: var(--color-accent);
}

/* ── Spatial UI: compact header when content panel is open ── */
.main-content.has-content .app-header {
    padding: var(--space-5) 0 var(--space-3) var(--space-5);
    transition: padding var(--dur-spatial) var(--ease-spatial);
}

.main-content.has-content .profile {
    gap: 4px;
}

.main-content.has-content .hero-headline {
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    max-width: none;
    line-height: 1.3;
}

.main-content.has-content .hero-name {
    font-size: 0.72rem;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity var(--dur-spatial) var(--ease-spatial),
                transform var(--dur-spatial) var(--ease-spatial),
                font-size var(--dur-spatial) var(--ease-spatial);
}

/* Re-show lang toggle when content panel is open */
.main-content.has-content .lang-toggle {
    display: inline-flex;
}

@media (min-width: 1024px) {
    /* ── Split layout: chat left, cards right ── */
    .main-content.split {
        flex-direction: row;
        align-items: stretch;
        padding: 0;
        /* fills the right-column gap below the panel with the same glass color */
        background: linear-gradient(to right, transparent 360px, var(--glass-panel-bg) 360px);
    }

    .main-content.split .chat-panel {
        flex: 0 0 360px;
        max-width: 360px;
        border-right: 1px solid rgba(255, 255, 255, 0.05);
        overflow: hidden; /* fallback */
        overflow: clip;   /* doesn't create a containing block — position:fixed escapes correctly */
    }

    /* Content panel: right column, stops above the full-width input bar */
    .main-content.split .content-panel {
        flex: 0 0 calc(100% - 360px);
        max-width: calc(100% - 360px);
        height: calc(100dvh - 100px);
        align-self: flex-start;
        opacity: 1;
        pointer-events: auto;
        overflow: visible; /* allow ::after glow to bleed outside panel bounds */
        background: var(--glass-panel-bg);
        -webkit-backdrop-filter: var(--glass-panel-blur);
        backdrop-filter: var(--glass-panel-blur);
        border-left: var(--glass-border-tint);
        z-index: 50;
    }

    @supports not (backdrop-filter: blur(1px)) {
        .main-content.split .content-panel {
            background: rgba(12, 14, 26, 0.98);
        }
    }

    .main-content.split .content-panel-scroll {
        flex: 1;
        overflow-y: auto;
        display: flex;
        flex-direction: column;
        padding: 40px 48px 120px; /* extra bottom: room for full-width fixed form */
        scrollbar-width: thin;
        scrollbar-color: rgba(255,255,255,0.06) transparent;
    }

    .main-content.split .content-panel-scroll::-webkit-scrollbar { width: 4px; }
    .main-content.split .content-panel-scroll::-webkit-scrollbar-track { background: transparent; }
    .main-content.split .content-panel-scroll::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.06); border-radius: 2px; }

    /* Chat form: full-width bar fixed at bottom — spans both columns */
    .main-content.split .chat-form {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        z-index: 200;
        padding: 14px 20px 24px 20px;
        border-top: none;
        background: transparent;
    }

    /* Chat messages: room for fixed form.
       Form max height = padding-top(14) + textarea-max(120) + padding-bottom(24) = 158px.
       Use 170px to give a few extra px of breathing room. */
    .main-content.split .chat-messages {
        padding-left: 20px;
        padding-right: 16px;
        padding-top: 16px;
        padding-bottom: 170px;
    }

    .main-content.split #thinking-indicator { padding-left: 20px; }

}



/* ================================================================
   CONTENT PANEL — right column in split layout (desktop only).
   Always display:flex but zero-width + invisible when not split.
   Transitions on flex-basis + opacity drive the reveal animation.
   ================================================================ */

/* Close button — invisible chrome, just the × glyph */
.content-panel-close {
    position: absolute;
    top: 12px;
    right: 16px;
    z-index: 10;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    padding: var(--space-1) var(--space-2);
    opacity: 0.5;
    transition: opacity 120ms ease;
}
.content-panel-close:hover { opacity: 1; }

/* Ambient glow — invisible in State A, activates in State B */
.content-panel::after {
    content: '';
    position: absolute;
    top: -60px;
    right: -60px;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(88, 98, 195, 0.12) 0%, transparent 70%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 800ms ease;
    z-index: 0;
}

.main-content.has-content .content-panel::after {
    opacity: 1;
}

.content-panel {
    position: relative;
    display: flex;
    flex-direction: column;
    flex: 0 0 0px;
    max-width: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: flex-basis 640ms cubic-bezier(0.16, 1, 0.3, 1),
                max-width  640ms cubic-bezier(0.16, 1, 0.3, 1),
                opacity    380ms ease 120ms;
}

/* ── CONTENT CARDS ── */

.content-card {
    background: var(--glass-card-bg);
    -webkit-backdrop-filter: var(--glass-card-blur);
    backdrop-filter: var(--glass-card-blur);
    border: var(--glass-border-tint);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    cursor: pointer;
    flex: 1 1 240px;
    min-width: 240px;
    width: auto;
    transition: border-color 200ms ease, background 200ms ease,
                transform 240ms cubic-bezier(0.34, 1.4, 0.64, 1),
                box-shadow 240ms ease;
    will-change: transform, opacity;
}

.content-card:hover {
    background: rgba(24, 27, 44, 0.95);
    border-color: rgba(110, 122, 220, 0.5);
    transform: translateY(-5px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5),
                0 0 0 1px rgba(110, 122, 220, 0.18);
}

/* In detail list sidebar — full width */
.spatial-detail-list .content-card {
    width: 100%;
}

/* ── Card group layout ── */
.spatial-category {
    margin-bottom: var(--space-6);
}

.spatial-category-label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    letter-spacing: 0.06em;
    margin-bottom: var(--space-3);
    padding-left: var(--space-1);
}

.spatial-cards-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

/* Gallery dim on hover */
.spatial-cards-row:hover .content-card {
    opacity: 0.55;
}
.spatial-cards-row:hover .content-card:hover {
    opacity: 1;
}

/* Card enter — clip-path reveal top→bottom (no scale = no PowerPoint) */
@keyframes cardEnter {
    0%   {
        opacity: 0;
        clip-path: inset(0 0 100% 0 round 10px);
        transform: translateY(8px);
    }
    100% {
        opacity: 1;
        clip-path: inset(0 0 0% 0 round 10px);
        transform: translateY(0);
    }
}

.card-entering {
    animation: cardEnter 620ms cubic-bezier(0.22, 1, 0.36, 1) both;
    will-change: clip-path, transform, opacity;
}

/* Card leave — dissolves back toward avatar direction */
@keyframes cardLeave {
    0%   { opacity: 1; transform: scale(1);    filter: blur(0px);  }
    100% { opacity: 0; transform: scale(0.88); filter: blur(6px); }
}

.card-leaving {
    animation: cardLeave 220ms cubic-bezier(0.4, 0, 1, 1) both;
    pointer-events: none;
    will-change: transform, opacity, filter;
}

/* Card header */
.card-type-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
}

.card-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    margin-top: var(--space-1);
    line-height: 1.3;
}

.card-tagline {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
    line-height: 1.4;
}

/* Narrative section (projects) */
.card-narrative {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.narrative-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.narrative-label {
    font-size: 0.7rem;
    letter-spacing: 0.02em;
    color: var(--color-accent);
}

.narrative-text {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Highlights (articles) */
.card-highlights {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.card-highlights li {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    padding-left: var(--space-3);
    position: relative;
    line-height: 1.4;
}

.card-highlights li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Footer */
.card-footer {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

/* Tech tags */
.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.card-tag {
    font-size: 0.7rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 2px var(--space-2);
}

/* External link */
.card-link {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 120ms ease;
}

.card-link:hover {
    color: var(--color-text);
}

/* Coming soon label */
.card-coming-soon {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    opacity: 0.6;
}


/* ── TYPOGRAPHIC BLOCKS (01 — Revenue systems) ──────────────── */

.block-intro {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--space-4);
}

.block-group {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.block-item {
    padding: var(--space-4) 0;
    border-bottom: 1px solid var(--color-border);
    transition: opacity 160ms ease;
    cursor: default;
}

.block-item:last-child {
    border-bottom: none;
}

/* Dim siblings on hover */
.block-group:hover .block-item {
    opacity: 0.55;
}

.block-group:hover .block-item:hover {
    opacity: 1;
}

/* Number + category on same line */
.block-header {
    display: flex;
    align-items: baseline;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.block-num {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.08em;
    flex-shrink: 0;
}

.block-cat {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
}

.block-desc {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    padding-left: 0;
}


/* ── Idle hint ─────────────────────────────────────────────── */
.idle-hint {
    color: var(--color-text-secondary);
    font-size: 0.8rem;
    font-style: italic;
    opacity: 0;
    animation: idle-fade-in 600ms ease forwards;
    padding: var(--space-2) 0;
    text-align: center;
}

@keyframes idle-fade-in {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 0.5; transform: translateY(0); }
}

/* ================================================================
   MOBILE INLINE CARDS — appear in chat stream on ≤1023px
   ================================================================ */

.message-cards {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
    width: 100%;
    animation: messageIn 0.4s var(--ease-out);
}

.m-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    background: var(--color-bg-card);
    transition: border-color 160ms ease;
}

.m-card:active {
    border-color: var(--color-border-hover);
}

.m-card-type {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
}

.m-card-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.3;
    margin: 0;
}

.m-card-tagline {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
    margin: 0;
}

.m-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.m-card-tag {
    font-size: 0.65rem;
    color: var(--color-text-secondary);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 2px var(--space-2);
}

.m-card-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border);
}

/* Project cards: "See more" opens full-screen overlay */
.m-card-detail-btn {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: 0.82rem;
    padding: var(--space-2) var(--space-3);
    cursor: pointer;
    text-align: left;
    transition: border-color 120ms ease, color 120ms ease;
    min-height: 44px;
}

.m-card-detail-btn:active {
    color: var(--color-text);
    border-color: var(--color-border-hover);
}


/* Article/social cards: external link inline */
.m-card-link {
    font-size: 0.82rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    min-height: 44px;
    display: flex;
    align-items: center;
    transition: color 120ms ease;
}

.m-card-link:active {
    color: var(--color-text);
}

/* ================================================================
   MOBILE DETAIL OVERLAY — full screen slide-up on ≤1023px
   ================================================================ */

.detail-overlay {
    position: fixed;
    inset: 0;
    z-index: 300;
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    transform: translateY(100%);
    transition: transform 300ms ease;
    /* Hidden by default */
}

.detail-overlay.open {
    transform: translateY(0);
}

.detail-overlay-bar {
    display: flex;
    align-items: center;
    padding: var(--space-4) var(--space-5);
    flex-shrink: 0;
    border-bottom: 1px solid var(--color-border);
}

.detail-overlay-close {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    padding: var(--space-1) var(--space-2);
    margin: calc(-1 * var(--space-1)) calc(-1 * var(--space-2));
    min-height: 44px;
    min-width: 44px;
    display: flex;
    align-items: center;
    transition: color 120ms ease;
}

.detail-overlay-close:active {
    color: var(--color-text);
}

.detail-overlay-scroll {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6) var(--space-5) var(--space-10);
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

/* On desktop: overlay never shows (mobile-only feature) */
@media (min-width: 1024px) {
    .detail-overlay {
        display: none;
    }
    .message-cards {
        display: none;
    }
}