:root {
    --bg-color: #050505;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-color: #3b82f6; /* Blue-ish */
    --accent-glow: rgba(59, 130, 246, 0.2);
    --border-color: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(255, 255, 255, 0.02);
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

html {
    width: 100%;
    min-height: 100%;
    background-color: var(--bg-color);
    overflow: hidden;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow: hidden; /* No scrolling for full screen feel */
    position: relative;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    animation: fadeInPage 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInPage {
    from {
        opacity: 0;
        transform: scale(0.98) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* Background Abstract Glow */
.background-glow {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(20, 30, 60, 0.35) 0%, transparent 40%);
    z-index: -1;
    pointer-events: none;
}

/* Top Actions Bar */
.top-bar {
    position: absolute;
    top: 2rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
}

/* Menu Header Area */
.menu-header {
    text-align: center;
    margin-bottom: 2rem;
    z-index: 2;
    padding: 0 1rem;
}

.menu-title {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.6rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    word-break: keep-all;
}

.menu-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-weight: 500;
    word-break: keep-all;
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
}

.logo span {
    color: var(--accent-color);
    margin-left: 0.3rem;
}

.logo-img {
    height: 3.0rem;
    display: inline-block;
    vertical-align: middle;
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.back-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.78rem 1.8rem;
    border-radius: 99px;
    font-size: 1.15rem;
    font-weight: 800;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-secondary);
    transform: translateX(-3px);
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: 99px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.lang-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

/* 2x3 Grid Container */
.grid-container {
    width: 90%;
    max-width: 1100px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding: 2rem 0;
}

.grid-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.2rem;
    text-decoration: none;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    color: var(--text-primary);
    text-align: center;
}

.grid-item:hover {
    background: rgba(59, 130, 246, 0.03);
    border-color: var(--accent-color);
    box-shadow: 0 0 35px var(--accent-glow);
    transform: translateY(-5px) scale(1.02);
}

/* Preset active/hover state for Booth highlight (as in screenshot) */
.grid-item.highlighted {
    background: rgba(59, 130, 246, 0.05);
    border-color: var(--accent-color);
    box-shadow: 0 0 30px var(--accent-glow);
}

.grid-num {
    font-size: 5.5rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(180deg, #ffffff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    transition: all 0.3s ease;
}

.grid-item:hover .grid-num, 
.grid-item.highlighted .grid-num {
    background: linear-gradient(180deg, #ffffff 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.grid-label {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.3s ease;
    word-break: keep-all;
}

.grid-item:hover .grid-label,
.grid-item.highlighted .grid-label {
    color: var(--text-primary);
}

/* Explanation Page Content Area */
.explain-container {
    max-width: 1200px;
    width: min(88vw, 980px);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    padding: 2rem;
}

.explain-badge {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
}

.explain-text {
    font-size: clamp(1.7rem, 2.9vw, 2.85rem);
    font-weight: 700;
    line-height: 1.42;
    color: #ffffff;
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    word-break: normal;
    overflow-wrap: anywhere;
    letter-spacing: -0.02em;
    white-space: normal;
}

.highlight {
    background: linear-gradient(90deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.highlight-orange {
    background: linear-gradient(90deg, #f59e0b, #ef4444);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.highlight-green {
    background: linear-gradient(90deg, #10b981, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* Sub-points for smaller detail if needed */
.explain-subpoints {
    display: flex;
    gap: 3rem;
    margin-top: 3rem;
    justify-content: center;
    flex-wrap: wrap;
}

.subpoint {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 1rem 2rem;
    border-radius: 99px;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Big QR Code Page styling */
.big-qr-wrapper {
    background: #080808;
    border: 2px solid rgba(59, 130, 246, 0.25);
    padding: 2.5rem;
    border-radius: 32px;
    box-shadow: 0 0 50px rgba(59, 130, 246, 0.15);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.big-qr-image {
    width: 280px;
    height: 280px;
    display: block;
}

.qr-link-text {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 2px dashed var(--accent-color);
    padding-bottom: 0.3rem;
    transition: all 0.3s;
}

.qr-link-text:hover {
    color: var(--accent-color);
    border-bottom-color: var(--text-primary);
}

/* Static QR Grid Card styling */
.qr-static-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    color: var(--text-primary);
    text-align: center;
}

.qr-grid-wrapper {
    background: #080808;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 120px;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.05);
}

.qr-grid-image {
    width: 100%;
    height: 100%;
    display: block;
}

/* Tablet kiosk / app-like fullscreen layout */
@media (min-width: 769px) and (max-width: 1180px) {
    html {
        height: 100%;
    }

    body {
        position: fixed;
        inset: 0;
        width: 100%;
        height: 100%;
        min-height: 100%;
        overflow: hidden;
        padding: 0;
        justify-content: center;
        align-items: center;
    }

    .top-bar {
        position: fixed;
        top: max(1.25rem, env(safe-area-inset-top));
        left: 50%;
        right: auto;
        width: min(calc(100vw - 3rem), 1120px);
        transform: translateX(-50%);
    }

    body:has(.grid-container) {
        gap: 1.15rem;
    }

    body:has(.explain-container) {
        display: grid;
        place-items: center;
    }

    .menu-header {
        width: min(94vw, 1080px);
        margin: 0;
        padding: 0;
    }

    .menu-title {
        font-size: clamp(1.9rem, 3.2vw, 2.6rem);
        line-height: 1.25;
    }

    .menu-subtitle {
        font-size: clamp(1rem, 1.7vw, 1.25rem);
    }

    .grid-container {
        width: min(94vw, 1080px);
        height: min(58vh, 540px);
        grid-template-rows: repeat(2, minmax(0, 1fr));
        gap: clamp(1rem, 1.8vw, 1.5rem);
        padding: 0;
    }

    .grid-item,
    .qr-static-card {
        min-height: 0;
        border-radius: 18px;
        padding: clamp(1.25rem, 2.3vw, 2.25rem) 1rem;
    }

    .grid-num {
        font-size: clamp(3.8rem, 8vw, 5.2rem);
    }

    .grid-label {
        font-size: clamp(1.08rem, 2vw, 1.35rem);
        line-height: 1.35;
    }

    .qr-grid-wrapper {
        width: clamp(96px, 12vw, 124px);
        height: clamp(96px, 12vw, 124px);
    }

    .explain-container {
        grid-area: 1 / 1;
        width: min(88vw, 980px);
        height: 100%;
        min-height: 100%;
        margin: 0 auto;
        padding: 5rem 1.5rem 4rem;
        justify-content: center;
        text-align: center;
    }

    .explain-badge {
        font-size: clamp(0.95rem, 1.45vw, 1.12rem);
        line-height: 1.35;
        margin-bottom: 1.1rem;
    }

    .explain-text {
        font-size: clamp(1.55rem, 2.55vw, 2.25rem);
        line-height: 1.42;
        max-width: 860px;
        width: 100%;
        margin: 0 auto;
        text-align: center;
        white-space: normal;
        overflow-wrap: break-word;
    }

    .explain-subpoints {
        gap: 0.85rem;
        margin-top: 1.45rem;
    }

    .subpoint {
        padding: 0.62rem 1.05rem;
        font-size: clamp(0.82rem, 1.25vw, 1rem);
    }

    .back-btn {
        padding: 0.85rem 2rem;
        font-size: 1.28rem;
    }
}

/* Mobile Responsiveness for Grid */
@media (max-width: 768px) {
    body {
        overflow-y: auto;
        padding-top: 6rem;
        padding-bottom: 4rem;
    }
    .grid-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .grid-item {
        padding: 2rem 1rem;
        flex-direction: row;
        justify-content: flex-start;
        padding-left: 3rem;
        gap: 2rem;
    }
    .grid-num {
        font-size: 3.5rem;
    }
    .grid-label {
        font-size: 1.2rem;
        text-align: left;
    }
    .explain-text {
        font-size: 1.75rem;
        line-height: 1.45;
        white-space: normal;
    }
    .back-btn {
        padding: 0.72rem 1.45rem;
        font-size: 1.08rem;
    }
    .big-qr-image {
        width: 200px;
        height: 200px;
    }
}