@import url('https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,500;9..144,600;9..144,700&family=Inter:wght@400;500;600;700&display=swap');

/* =====================================================
   LUMEN DESIGN SYSTEM
===================================================== */

:root {
    color-scheme: light;

    --bg: #f5f5fa;
    --surface: #ffffff;
    --surface-tint: #f2f4ff;

    --ink: #1b211d;
    --ink-soft: #565f58;
    --ink-faint: #868a8f;

    --line: #d8dae2;
    --line-strong: #c7cad6;

    --accent: #a7afe8;
    --accent-deep: #6264b3;
    --accent-soft: rgba(167, 175, 232, 0.16);

    --font-display: "Fraunces", Georgia, serif;
    --font-body: "Inter", "Segoe UI", Arial, sans-serif;

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 26px;

    --shadow-soft:
        0 8px 30px rgba(27, 33, 29, 0.05);

    --shadow-card:
        0 14px 40px rgba(27, 33, 29, 0.07);

    --shadow-hover:
        0 14px 34px rgba(27, 33, 29, 0.10);

    --transition-fast: 150ms ease;
    --transition-normal: 220ms ease;
}


/* =====================================================
   GLOBAL RESET
===================================================== */

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

html {
    width: 100%;
    min-height: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    width: 100%;
    min-height: 100vh;

    font-family: var(--font-body);
    color: var(--ink);
    background: var(--bg);

    overflow-x: hidden;

    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

button,
input {
    font: inherit;
}

button {
    -webkit-tap-highlight-color: transparent;
}

a {
    color: inherit;
}


/* =====================================================
   PAGE SHELL
===================================================== */

.page-shell {
    width: 100%;
    min-height: 100vh;

    display: flex;
    flex-direction: column;

    gap: 24px;
    padding: 24px;
}


/* =====================================================
   CARDS
===================================================== */

.hero-card,
.demo-card {
    width: 100%;

    background: var(--surface);

    border: 1px solid var(--line);
    border-radius: var(--radius-lg);

    box-shadow: var(--shadow-soft);
}


/* =====================================================
   HERO
===================================================== */

.hero-card {
    position: relative;
    overflow: hidden;

    min-height: 42vh;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    gap: 20px;
    padding: 64px 32px;

    text-align: center;
}

/* Decorative atmospheric glow */

.hero-glow {
    position: absolute;

    top: -30%;
    left: 50%;

    width: min(700px, 80vw);
    height: min(700px, 80vw);

    transform: translateX(-50%);

    background:
        radial-gradient(
            circle,
            rgba(46, 128, 199, 0.24) 0%,
            rgba(46, 77, 199, 0.08) 45%,
            rgba(51, 46, 199, 0) 72%
        );

    pointer-events: none;
}

.hero-copy {
    position: relative;
    z-index: 1;

    width: 100%;
    max-width: 900px;

    display: flex;
    flex-direction: column;
    align-items: center;

    text-align: center;
}

.top-meta {
    display: flex;
    align-items: center;
    justify-content: center;

    gap: 10px;
    flex-wrap: wrap;

    margin-bottom: 12px;
}

.eyebrow {
    margin: 0;

    font-family: var(--font-body);
    font-size: 0.78rem;
    font-weight: 600;

    letter-spacing: 0.08em;
    text-transform: uppercase;

    color: var(--accent-deep);
}

.version-pill {
    margin: 0;
    padding: 5px 10px;

    border: 1px solid var(--line);
    border-radius: 999px;

    background: var(--surface-tint);

    color: var(--ink-soft);

    font-size: 0.7rem;
    font-weight: 600;

    line-height: 1;
}


/* =====================================================
   TYPOGRAPHY
===================================================== */

h1,
h2,
h3,
p {
    margin: 0;
}

h1,
h2,
h3 {
    font-family: var(--font-display);
    font-weight: 600;

    letter-spacing: -0.02em;
    color: var(--ink);
}

h1 {
    font-size: clamp(2.4rem, 5vw, 5rem);
    line-height: 1.05;
}

h2 {
    font-size: clamp(1.5rem, 2.5vw, 2.2rem);
    line-height: 1.15;
}

h3 {
    font-size: 1.15rem;
    line-height: 1.25;
}

.hero-text {
    max-width: 680px;
    margin-top: 4px;

    color: var(--ink-soft);

    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    line-height: 1.6;

    text-align: center;
}


/* =====================================================
   LUMEN LOGO
===================================================== */

.hero-visual {
    position: relative;
    z-index: 1;

    width: 100%;

    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-visual img {
    display: block;

    width: min(260px, 45vw);
    height: auto;

    margin: 0 auto;

    transition:
        transform var(--transition-normal),
        filter var(--transition-normal);
}

.hero-visual img:hover {
    transform: translateY(-2px);
}


/* =====================================================
   DEMO / APP CARD
===================================================== */

.demo-card {
    padding: clamp(20px, 4vw, 40px);

    box-shadow: var(--shadow-card);
}

.demo-header {
    display: flex;
    flex-direction: column;

    gap: 6px;
    margin-bottom: 24px;
}

.demo-header h2 {
    font-size: clamp(1.4rem, 2.5vw, 2rem);
}

.demo-header p {
    color: var(--ink-soft);

    font-size: clamp(0.85rem, 1.4vw, 1rem);
    line-height: 1.5;
}


/* =====================================================
   APP ROOT
===================================================== */

#app-root {
    width: 100%;

    display: flex;
    flex-direction: column;
    align-items: center;

    gap: 20px;
    padding: clamp(16px, 3vw, 32px);

    background: var(--surface-tint);

    border: 1px solid var(--line);
    border-radius: var(--radius-md);
}


/* =====================================================
   CANVAS
===================================================== */

canvas {
    display: block;

    width: auto;
    max-width: 100%;
    height: auto;

    background: #000000;

    border: 1px solid var(--line);
    border-radius: var(--radius-md);

    box-shadow:
        0 8px 24px rgba(0, 0, 0, 0.08);
}


/* =====================================================
   VOICE BUTTON
===================================================== */

.voice-button {
    min-height: 48px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    padding: 13px 21px;

    border: 1px solid var(--ink);
    border-radius: 999px;

    background: var(--ink);
    color: var(--bg);

    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;

    letter-spacing: 0.01em;

    cursor: pointer;

    box-shadow:
        0 4px 14px rgba(27, 33, 29, 0.08);

    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.voice-button:hover {
    background: var(--accent-deep);
    border-color: var(--accent-deep);

    transform: translateY(-2px);

    box-shadow: var(--shadow-hover);
}

.voice-button:active {
    transform: translateY(0);

    box-shadow:
        0 3px 8px rgba(27, 33, 29, 0.08);
}


/* =====================================================
   HOME BUTTON
===================================================== */

.home-button {
    display: inline-block;

    margin-top: 8px;

    color: var(--accent-deep);

    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;

    text-decoration: none;

    cursor: pointer;

    transition:
        color var(--transition-fast),
        opacity var(--transition-fast);
}

.home-button:hover {
    color: var(--ink);

    text-decoration: underline;
    text-underline-offset: 3px;
}

.home-button:active {
    color: var(--accent-deep);
}


/* =====================================================
   COMMUNICATION BOARD
===================================================== */

.communication-board {
    width: min(100%, 560px);

    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 10px;

    margin: 0 auto;
}

.communication-button {
    width: 100%;
    min-height: 58px;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 12px 8px;

    border: 1px solid var(--line);
    border-radius: var(--radius-md);

    background: var(--surface);
    color: var(--ink);

    font-family: var(--font-body);
    font-size: 0.92rem;
    font-weight: 600;

    cursor: pointer;

    box-shadow:
        0 2px 8px rgba(27, 33, 29, 0.025);

    transition:
        border-color var(--transition-fast),
        background var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.communication-button:hover {
    border-color: var(--accent-deep);

    background: var(--accent-soft);
    color: var(--accent-deep);

    transform: translateY(-2px);

    box-shadow:
        0 7px 18px rgba(27, 33, 29, 0.06);
}

.communication-button:active {
    transform: translateY(0);

    box-shadow:
        0 2px 7px rgba(27, 33, 29, 0.04);
}

.communication-button.active {
    background: var(--accent);
    border-color: var(--accent);

    color: var(--ink);

    box-shadow:
        0 5px 16px rgba(98, 100, 179, 0.12);
}


/* =====================================================
   ACCESSIBILITY / FOCUS
===================================================== */

.communication-button:focus-visible,
.voice-button:focus-visible,
.home-button:focus-visible {
    outline: 2px solid var(--accent-deep);
    outline-offset: 3px;
}


/* =====================================================
   REDUCED MOTION
===================================================== */

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
    }

    .hero-visual img,
    .voice-button,
    .communication-button,
    .home-button {
        transition: none;
    }
}


/* =====================================================
   TABLETS
===================================================== */

@media (max-width: 900px) {
    .page-shell {
        padding: 18px;
        gap: 18px;
    }

    .hero-card {
        min-height: 38vh;
        padding: 50px 24px;
    }

    .hero-visual img {
        width: min(210px, 45vw);
    }
}


/* =====================================================
   MOBILE
===================================================== */

@media (max-width: 600px) {
    body {
        width: 100%;
    }

    .page-shell {
        width: 100%;
        min-height: 100vh;

        padding: 10px;
        gap: 12px;
    }

    .hero-card,
    .demo-card {
        border-radius: 16px;
    }

    .hero-card {
        min-height: auto;

        padding: 38px 16px 34px;

        gap: 14px;
    }

    .hero-copy {
        max-width: 100%;
    }

    .hero-visual img {
        width: min(145px, 45vw);
    }

    .hero-text {
        max-width: 100%;

        font-size: 0.88rem;
        line-height: 1.55;
    }

    .demo-card {
        padding: 14px;
    }

    .demo-header {
        margin-bottom: 16px;
    }

    #app-root {
        padding: 10px;
        gap: 12px;

        border-radius: 12px;
    }

    canvas {
        width: 100%;
        max-width: 100%;
        height: auto !important;

        border-radius: 10px;
    }

    .communication-board {
        width: 100%;

        grid-template-columns:
            repeat(3, minmax(0, 1fr));

        gap: 6px;
    }

    .communication-button {
        min-height: 48px;

        padding: 8px 4px;

        font-size: 0.75rem;

        border-radius: 9px;
    }

    .voice-button {
        width: min(100%, 280px);

        padding: 11px 15px;

        font-size: 0.8rem;
    }

    .home-button {
        font-size: 0.8rem;
    }
}


/* =====================================================
   VERY SMALL PHONES
===================================================== */

@media (max-width: 380px) {
    .page-shell {
        padding: 7px;
    }

    .hero-card {
        padding: 30px 12px;
    }

    .hero-visual img {
        width: 110px;
    }

    .communication-board {
        gap: 4px;
    }

    .communication-button {
        min-height: 43px;

        padding: 6px 2px;

        font-size: 0.67rem;
    }

    .demo-header h2 {
        font-size: 1.15rem;
    }

    .demo-header p {
        font-size: 0.72rem;
    }
}