:root {
    --bg: #0b0e1a;
    --bg-dark: #060812;
    --accent: #00ff9d;
    --accent2: #00d4ff;
    --accent3: #7c9eff;
    --text: #e0f0ff;
    --text-dim: #a3bffa;
    --card: rgba(20, 25, 45, 0.65);
    --glow: 0 0 20px;
    --glow-intense: 0 0 40px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --header-height: 70px;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: linear-gradient(145deg, var(--bg-dark) 0%, var(--bg) 100%);
    color: var(--text);
    min-height: 100dvh;
    overflow-x: hidden;
}

/* Desktop Layout (≥1025px) */
@media (min-width: 1025px) {
    body {
        padding: 0;
    }
}

/* Mobile Layout (≤1024px) */
@media (max-width: 1024px) {
    body {
        padding: 0.75rem;
    }
}

/* Custom Scrollbar */
@media (min-width: 768px) {
    ::-webkit-scrollbar {
        width: 8px;
    }

    ::-webkit-scrollbar-track {
        background: var(--bg-dark);
    }

    ::-webkit-scrollbar-thumb {
        background: linear-gradient(var(--accent), var(--accent2));
        border-radius: 4px;
    }
}

/* Desktop Navbar - Only visible on large screens */
.navbar-desktop {
    position: fixed;
    inset: 0 0 auto 0;
    padding: 0.9rem 5vw;
    background: rgba(8, 12, 30, 0.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 255, 157, 0.16);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

@media (max-width: 1024px) {
    .navbar-desktop {
        display: none;
    }
}

.logo {
    font-family: 'Orbitron', monospace;
    font-size: clamp(1.4rem, 5vw, 1.8rem);
    font-weight: 800;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    gap: clamp(1rem, 3vw, 1.8rem);
    align-items: center;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 500;
    font-size: clamp(0.8rem, 3vw, 0.95rem);
    transition: all 0.22s;
    padding: 0.3rem 0.5rem;
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent);
    text-shadow: 0 0 12px var(--accent);
}

.btn-small {
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    color: #0b1121 !important;
    padding: 0.4rem 1rem;
    border-radius: 50vmax;
    font-weight: 700;
    font-size: 0.85rem;
    box-shadow: var(--glow) rgba(0, 255, 157, 0.45);
}

/* Sidebar Toggle Button - Only visible on mobile (≤1024px) */
.sidebar-toggle {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1100;
    background: var(--card);
    border: 1px solid var(--accent2);
    color: var(--accent2);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
    box-shadow: var(--glow) var(--accent2);
}

@media (max-width: 1024px) {
    .sidebar-toggle {
        display: flex;
    }
}

/* Sidebar Navigation - Only visible on mobile (≤1024px) */
.admin-sidebar {
    display: none;
}

@media (max-width: 1024px) {
    .admin-sidebar {
        display: block;
        position: fixed;
        top: 1rem;
        left: 1rem;
        transform: translateX(-120%);
        opacity: 0;
        width: 260px;
        background: rgba(8, 12, 24, 0.98);
        backdrop-filter: blur(16px);
        border: 1px solid var(--accent2);
        border-radius: 2rem;
        padding: 1.5rem 0.8rem;
        transition: transform 0.3s, opacity 0.2s;
        z-index: 2000;
        box-shadow: var(--glow-intense) var(--accent2);
    }

    .admin-sidebar.open {
        transform: translateX(0);
        opacity: 1;
    }
}

.admin-sidebar .sidebar-logo {
    font-family: 'Orbitron', monospace;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(90deg, var(--accent2), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0 0.5rem 1.2rem 0.5rem;
    border-bottom: 1px solid var(--accent2);
    margin-bottom: 1.2rem;
}

.admin-sidebar .sidebar-logo i {
    color: var(--accent2);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.7rem 1rem;
    color: var(--text-dim);
    text-decoration: none;
    font-weight: 500;
    border-radius: 2rem;
    transition: 0.2s;
    font-size: 0.95rem;
}

.sidebar-nav a i {
    width: 1.5rem;
    font-size: 1.2rem;
    color: var(--accent2);
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(0, 212, 255, 0.15);
    color: var(--accent2);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid rgba(0, 255, 157, 0.1);
    margin-top: 1.5rem;
}

.sidebar-footer .signup-link {
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    color: #0b1121;
    padding: 0.7rem 1rem;
    border-radius: 2rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
    text-decoration: none;
}

.sidebar-footer .logout-link {
    background: linear-gradient(90deg,rgba(225, 62, 62, 0.81), red);
    color: #0b1121;
    padding: 0.7rem 1rem;
    border-radius: 2rem;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
    text-decoration: none;
}

/* Main Content Container */
.main-container {
    max-width: 1300px;
    margin: 0 auto;
    width: 100%;
}

/* Desktop padding for navbar */
@media (min-width: 1025px) {
    .main-container {
        padding-top: 80px;
    }
}

/* Mobile adjustments */
@media (max-width: 1024px) {
    .main-container {
        padding-top: 0.5rem;
    }
}

/* ---- hero ---- */
.hero {
    padding: clamp(20px, 8vh, 60px) 4vw 40px;
    display: grid;
    grid-template-columns: 1fr minmax(300px, 700px);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: center;
    max-width: 1300px;
    margin: 0 auto;
}

@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.hero h1 {
    font-family: 'Orbitron', monospace;
    font-size: clamp(2.2rem, 7vw, 4.5rem);
    font-weight: 900;
    line-height: 0.92;
}

.gradient-text {
    background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3), var(--accent));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: gradientFlow 12s ease infinite;
}

@keyframes gradientFlow {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.hero-subtitle {
    font-size: clamp(1rem, 2.2vw, 1.25rem);
    color: var(--text-dim);
    margin: 1rem 0 1.6rem;
    max-width: 38ch;
    line-height: 1.4;
}

@media (min-width: 900px) {
    .hero-subtitle {
        margin-left: 0;
        margin-right: 0;
    }
}

.cta-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
}

@media (min-width: 900px) {
    .cta-buttons {
        justify-content: flex-start;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.7rem 1.8rem;
    border-radius: 50vmax;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.28s ease;
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    color: #0b1121;
    box-shadow: var(--glow) rgba(0, 255, 157, 0.45);
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 35px rgba(0, 255, 157, 0.35);
}

.btn-outline {
    border: 1.5px solid var(--accent);
    color: var(--accent);
    background: transparent;
}

/* game area */
.game-preview {
    background: rgba(12, 18, 42, 0.75);
    border-radius: 1.6rem;
    padding: 1rem;
    border: 1px solid rgba(0, 255, 157, 0.2);
    backdrop-filter: blur(10px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
    margin: 0 auto;
    width: fit-content;
    max-width: 100%;
    position: relative;
}

/* Sound toggle button */
.sound-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 15;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(0, 255, 157, 0.5);
    color: var(--accent);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(6px);
    transition: all 0.2s;
    font-size: 1.2rem;
}

.sound-toggle:hover {
    background: rgba(0, 255, 157, 0.2);
    transform: scale(1.05);
}

@media (max-width: 600px) {
    .sound-toggle {
        width: 32px;
        height: 32px;
        font-size: 0.9rem;
        top: 0.5rem;
        right: 0.5rem;
    }
}

.canvas-container {
    background: #000814;
    border-radius: 1.2rem;
    overflow: hidden;
    border: 2px solid rgba(0, 212, 255, 0.25);
    aspect-ratio: 500 / 350;
    width: min(620px, calc(100vw - 2rem));
    max-width: 100%;
    position: relative;
}

#gameCanvas {
    width: 100%;
    height: 100%;
    image-rendering: pixelated;
    touch-action: none;
    display: block;
}

#start-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.68);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-family: 'Orbitron', monospace;
    font-size: clamp(1.6rem, 6vw, 3rem);
    font-weight: 700;
    text-shadow: 0 0 24px rgba(0, 255, 157, 0.7);
    cursor: pointer;
    transition: opacity 0.7s ease;
    z-index: 10;
    user-select: none;
}

#start-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

#start-overlay .subtitle {
    font-family: 'Inter', sans-serif;
    font-size: clamp(0.85rem, 3.5vw, 1.1rem);
    margin-top: 0.8rem;
    opacity: 0.9;
}

#play-button {
    display: none;
    position: absolute;
    bottom: 15%;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    color: #0b1121;
    font-family: 'Orbitron', monospace;
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 900;
    padding: 0.5rem 1.8rem;
    border-radius: 999px;
    box-shadow: 0 0 40px rgba(0, 255, 157, 0.6);
    border: none;
    cursor: pointer;
    z-index: 11;
}

@media (max-width: 768px) {
    #play-button {
        display: block;
    }
}

/* Game over modal */
.game-over-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.4s ease;
    padding: 1rem;
}

.modal-content {
    background: linear-gradient(145deg, #1a1f35, #0b0e1a);
    border: 2px solid var(--accent);
    border-radius: 1.5rem;
    padding: 1.5rem;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: 0 0 40px rgba(0, 255, 157, 0.25);
    animation: slideUp 0.4s ease;
}

@media (min-width: 768px) {
    .modal-content {
        max-width: 380px;
        padding: 1.6rem;
    }
}

@media (min-width: 1024px) {
    .modal-content {
        max-width: 400px;
    }
}

@media (max-width: 480px) {
    .modal-content {
        padding: 1.2rem;
        max-width: 320px;
    }
}

.modal-content h2 {
    font-family: 'Orbitron', monospace;
    font-size: clamp(1.5rem, 5vw, 2rem);
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
}

.confetti {
    font-size: clamp(1.5rem, 4vw, 2rem);
    margin: 0.25rem 0;
    animation: bounce 0.8s ease infinite;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin: 1rem 0;
}

@media (max-width: 480px) {
    .stats-grid {
        gap: 0.5rem;
        margin: 0.75rem 0;
    }
}

.stat-item {
    background: rgba(255, 255, 255, 0.05);
    padding: 0.75rem 0.5rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(0, 255, 157, 0.15);
}

@media (max-width: 480px) {
    .stat-item {
        padding: 0.5rem 0.25rem;
    }
}

.stat-label {
    font-size: clamp(0.7rem, 2.5vw, 0.8rem);
    color: var(--text-dim);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-family: 'Orbitron', monospace;
    font-size: clamp(1.2rem, 4vw, 1.8rem);
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
}

@media (max-width: 480px) {
    .stat-value {
        font-size: 1.2rem;
    }
}

.modal-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    margin-top: 1.25rem;
}

@media (max-width: 480px) {
    .modal-buttons {
        gap: 0.5rem;
        margin-top: 1rem;
    }
}

.modal-btn {
    padding: 0.5rem 1.2rem;
    border-radius: 50vmax;
    font-family: 'Orbitron', monospace;
    font-weight: 600;
    font-size: clamp(0.8rem, 3vw, 0.9rem);
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

@media (max-width: 480px) {
    .modal-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

.modal-btn-primary {
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    color: #0b1121;
}

.modal-btn-secondary {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 255, 157, 0.25);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.game-controls {
    margin-top: 1rem;
    display: flex;
    gap: 0.9rem;
    justify-content: center;
    flex-wrap: wrap;
}

.game-controls button {
    background: rgba(0, 255, 157, 0.14);
    border: 1.5px solid rgba(0, 255, 157, 0.5);
    color: var(--accent);
    padding: 0.6rem 1.4rem;
    border-radius: 50vmax;
    font-family: 'Orbitron', monospace;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.22s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.game-controls button:hover {
    background: rgba(0, 255, 157, 0.28);
    border-color: var(--accent);
    box-shadow: 0 0 18px rgba(0, 255, 157, 0.35);
    transform: translateY(-1px);
}

.game-controls button.expand {
    background: linear-gradient(90deg, #00d4ff, #00ff9d);
    color: #0b1121;
    border: none;
    font-weight: 700;
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
}

.game-controls button.expand:hover {
    transform: translateY(-2px) scale(1.04);
    box-shadow: 0 12px 32px rgba(0, 212, 255, 0.45);
}

@media (max-width: 767px) {
    .game-controls {
        gap: 1.2rem;
    }

    .game-controls button:not(.expand) {
        display: none;
    }

    .game-controls button.expand {
        padding: 0.7rem 2rem;
        font-size: 1.1rem;
    }
}

.game-hud {
    margin-top: 0.8rem;
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.8rem;
    border-radius: 50vmax;
    background: rgba(0, 255, 157, 0.1);
    border: 1px solid rgba(0, 255, 157, 0.35);
    color: var(--accent);
}

.features,
.leaderboard {
    padding: 4rem 4vw;
    max-width: 1300px;
    margin: 0 auto;
}

.section-title {
    font-family: 'Orbitron', monospace;
    text-align: center;
    font-size: clamp(2rem, 5vw, 3.2rem);
    margin-bottom: 2.5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.2rem;
}

.feature-card {
    background: var(--card);
    padding: 1.6rem 1.2rem;
    border-radius: 1.2rem;
    border: 1px solid rgba(0, 255, 157, 0.12);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.feature-icon {
    font-size: 2.2rem;
    margin-bottom: 0.8rem;
    color: var(--accent);
}

.feature-card h3 {
    font-size: 1.3rem;
}

.feature-card p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.leaderboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.leaderboard-card {
    background: var(--card);
    border-radius: 1.4rem;
    padding: 1.6rem;
    border: 1px solid rgba(0, 212, 255, 0.2);
    backdrop-filter: blur(10px);
}

.leaderboard-card h3 {
    font-size: 1.4rem !important;
    margin-bottom: 1rem !important;
}

.rank-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.rank-number {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    color: var(--accent);
}

.player-info {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    font-size: 0.95rem;
}

.player-flag {
    font-size: 1.1rem;
}

.score {
    font-weight: 700;
    color: var(--accent2);
    font-size: 0.95rem;
}

/* Footer */
footer {
    padding: 2rem 5vw 1.5rem;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    color: var(--text-dim);
    border-top: 1px solid rgba(0, 255, 157, 0.1);
    font-size: 0.8rem;
    margin-top: 2rem;
    width: 100%;
    padding-bottom: calc(1.5rem + var(--safe-bottom));
}

.footer-developer {
    font-family: 'Orbitron', monospace;
    font-size: 0.9rem;
    color: #8ab4ff;
}

footer a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.8rem;
}

footer a:hover {
    color: var(--accent);
}

@media (max-width: 930px) {
    footer {
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    footer p {
        margin-top: 0.8rem;
    }

    .footer-developer {
        margin-top: 0.5rem;
        text-align: center;
    }
}

@media (max-width: 420px) {
    .btn {
        padding: 0.6rem 1.2rem;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }
}

:fullscreen #gameCanvas,
:fullscreen .canvas-container {
    border-radius: 0;
    border: none;
    width: 100vw;
    height: 100vh;
    aspect-ratio: unset;
}

:fullscreen .game-controls,
:fullscreen .game-hud,
:fullscreen .sound-toggle {
    display: none;
}

/* Disable body scroll when sidebar open on mobile */
body.sidebar-open {
    overflow: hidden;
}