/* Reset và Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    min-height: 100vh;
    width: 100vw;
    overflow-x: hidden;
    transition: background-color 0.3s ease;
}

/* Background */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('./images/background.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    z-index: -2;
    transition: filter 0.3s ease;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: -1;
    display: none;
}

.overlay.show {
    display: block;
}

/* Auto-play Unlock */
.autoplay-unlock {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    color: white;
    text-align: center;
    padding: 20px;
    animation: fadeIn 0.4s ease-out;
}

.autoplay-unlock.hidden {
    animation: fadeOut 0.3s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; display: none; }
}

.autoplay-message {
    margin-bottom: 30px;
    max-width: 600px;
    animation: slideUp 0.5s ease-out 0.2s both;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.autoplay-message h2 {
    font-size: 32px;
    margin-bottom: 15px;
    color: var(--primary-color, #1DB954);
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

.autoplay-message p {
    font-size: 18px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.9);
}

.autoplay-button {
    background: linear-gradient(135deg, var(--primary-color, #1DB954), var(--secondary-color, #191414));
    border: none;
    color: white;
    padding: 20px 50px;
    border-radius: 50px;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    font-weight: bold;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
    box-shadow: 0 5px 15px rgba(29, 185, 84, 0.4);
    animation: pulse 2s infinite 0.5s, slideUp 0.5s ease-out 0.4s both;
    position: relative;
    overflow: hidden;
}

.autoplay-button:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(29, 185, 84, 0.6);
}

@keyframes pulse {
    0% { box-shadow: 0 5px 15px rgba(29, 185, 84, 0.4); }
    50% { box-shadow: 0 5px 25px rgba(29, 185, 84, 0.6); }
    100% { box-shadow: 0 5px 15px rgba(29, 185, 84, 0.4); }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    animation: slideDown 0.5s ease-out;
    transition: all 0.3s ease;
}

@keyframes slideDown {
    from { transform: translateY(-100%); }
    to { transform: translateY(0); }
}

.title {
    font-size: 28px;
    font-weight: bold;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.nav-menu a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.nav-menu a.active {
    background: rgba(255, 255, 255, 0.3);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color, #1DB954);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Content Container */
.container {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding-top: 80px;
    padding-bottom: 40px;
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.container.show {
    display: flex;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Content Sections */
.section {
    display: none;
    width: 100%;
    opacity: 0;
    transform: translateY(20px);
}

.section.active {
    display: block;
    animation: fadeInSlide 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

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

/* Cards */
.card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 50px 60px;
    max-width: 600px;
    width: 90%;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.2);
    text-align: center;
    margin: 20px auto;
    transform: translateY(20px);
    opacity: 0;
    animation: cardAppear 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    animation-delay: 0.2s;
    transition: all 0.3s ease;
}

@keyframes cardAppear {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.card h2 {
    font-size: 32px;
    color: white;
    margin-bottom: 20px;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: color 0.3s ease;
}

.card p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    transition: color 0.3s ease;
}

.card ul {
    list-style: none;
    text-align: left;
    margin-top: 15px;
}

.card li {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.9);
    padding: 10px 0;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateX(-20px);
    animation: listItemAppear 0.4s ease-out forwards;
    transition: color 0.3s ease;
}

.card li:nth-child(1) { animation-delay: 0.3s; }
.card li:nth-child(2) { animation-delay: 0.4s; }
.card li:nth-child(3) { animation-delay: 0.5s; }
.card li:nth-child(4) { animation-delay: 0.6s; }

@keyframes listItemAppear {
    to { opacity: 1; transform: translateX(0); }
}

.card li:before {
    content: "✨ ";
    margin-right: 10px;
}

/* Social Buttons */
.social-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.social-btn {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 12px 25px;
    border-radius: 25px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: bold;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow: hidden;
}

.social-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.15);
}

.social-btn.discord {
    background: rgba(88, 101, 242, 0.3);
    border-color: rgba(88, 101, 242, 0.5);
}

.social-btn.discord:hover {
    background: rgba(88, 101, 242, 0.5);
}

.social-btn.roblox {
    background: rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.3);
}

.social-btn.roblox:hover {
    background: rgba(0, 0, 0, 0.6);
}

.social-btn.facebook {
    background: rgba(59, 89, 152, 0.3);
    border-color: rgba(59, 89, 152, 0.5);
}

.social-btn.facebook:hover {
    background: rgba(59, 89, 152, 0.5);
}

/* Music Player */
.music-player {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    padding: 12px 20px;
    z-index: 50;
    min-width: 300px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    opacity: 0;
    transform: translateY(30px);
    animation: slideUpPlayer 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) 0.3s forwards;
    transition: all 0.3s ease;
}

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

.player-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    align-items: center;
}

.player-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 18px;
    padding: 5px;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.player-btn:hover {
    color: var(--primary-color, #1DB954);
    transform: scale(1.2);
}

.player-btn.play {
    font-size: 24px;
}

.progress-bar {
    width: 100%;
    height: 3px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    margin-bottom: 8px;
    cursor: pointer;
    overflow: hidden;
    position: relative;
    transition: height 0.3s ease;
}

.progress-bar:hover {
    height: 6px;
}

.progress-bar:hover .progress-fill::after {
    opacity: 1;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color, #1DB954);
    width: 0%;
    transition: width 0.1s linear;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    right: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
    box-shadow: 0 0 10px var(--primary-color, rgba(29, 185, 84, 0.5));
}

.time-display {
    display: flex;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.6);
    font-size: 10px;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

.volume-control {
    display: none;
    position: absolute;
    bottom: 50px;
    right: 20px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 15px 10px;
    width: 40px;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    animation: fadeInScale 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-origin: bottom right;
    transition: all 0.3s ease;
}

@keyframes fadeInScale {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

.volume-control.show {
    display: flex;
}

.volume-slider {
    width: 30px;
    height: 100px;
    background: linear-gradient(to top, var(--primary-color, #1DB954), rgba(29, 185, 84, 0.3));
    outline: none;
    cursor: pointer;
    writing-mode: vertical-lr;
    direction: rtl;
    transition: all 0.3s ease;
}

.volume-slider:hover {
    background: linear-gradient(to top, var(--primary-color, #1DB954), rgba(29, 185, 84, 0.5));
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: slider-thumb;
    appearance: slider-thumb;
    width: 15px;
    height: 15px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.volume-slider::-moz-range-thumb {
    width: 15px;
    height: 15px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.volume-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

/* Click Effect */
.click-effect {
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.click-effect:active {
    transform: scale(0.95) !important;
    transition: transform 0.1s ease !important;
}

/* Theme Switcher */
.theme-switcher {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 50;
}

.theme-toggle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(30deg);
    background: rgba(0, 0, 0, 0.6);
}

.theme-panel {
    position: absolute;
    bottom: 70px;
    left: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: 15px;
    width: 200px;
    display: none;
    animation: fadeInScale 0.3s ease;
}

.theme-panel.show {
    display: block;
}

.theme-title {
    color: white;
    font-size: 14px;
    margin-bottom: 10px;
    text-align: center;
    opacity: 0.8;
}

.theme-colors {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 15px;
}

.color-option {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.color-option:hover {
    transform: scale(1.2);
}

.color-option.active {
    border-color: white;
    transform: scale(1.1);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.theme-mode {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.mode-btn {
    padding: 8px 15px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.3s ease;
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.mode-btn.active {
    background: rgba(255, 255, 255, 0.3);
    border-color: white;
}

/* Light Mode Styles */
body.light-mode {
    background-color: #f5f5f5;
}

body.light-mode .background {
    filter: brightness(1.2);
}

body.light-mode .navbar {
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

body.light-mode .title,
body.light-mode .nav-menu a {
    color: #333;
    text-shadow: none;
}

body.light-mode .nav-menu a:hover {
    background: rgba(0, 0, 0, 0.1);
}

body.light-mode .nav-menu a.active {
    background: rgba(0, 0, 0, 0.15);
}

body.light-mode .card {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
}

body.light-mode .card h2,
body.light-mode .card p,
body.light-mode .card li {
    color: #333;
    text-shadow: none;
}

body.light-mode .social-btn {
    background: rgba(0, 0, 0, 0.1);
    border-color: rgba(0, 0, 0, 0.2);
    color: #333;
}

body.light-mode .social-btn:hover {
    background: rgba(0, 0, 0, 0.15);
}

body.light-mode .social-btn.discord {
    background: rgba(88, 101, 242, 0.2);
    color: #333;
}

body.light-mode .social-btn.facebook {
    background: rgba(59, 89, 152, 0.2);
    color: #333;
}

body.light-mode .music-player {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.1);
}

body.light-mode .player-btn,
body.light-mode .time-display {
    color: #333;
}

body.light-mode .progress-bar {
    background: rgba(0, 0, 0, 0.2);
}

body.light-mode .theme-toggle {
    background: rgba(255, 255, 255, 0.4);
    color: #333;
}

body.light-mode .theme-panel {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
}

body.light-mode .theme-title {
    color: #333;
}

body.light-mode .mode-btn {
    background: rgba(0, 0, 0, 0.1);
    color: #333;
    border-color: rgba(0, 0, 0, 0.2);
}

body.light-mode .mode-btn.active {
    background: rgba(0, 0, 0, 0.2);
    border-color: #333;
}

/* Theme Color Variables */
:root {
    --primary-color: #1DB954;
    --secondary-color: #191414;
}

.theme-green {
    --primary-color: #1DB954;
    --secondary-color: #191414;
}

.theme-blue {
    --primary-color: #007bff;
    --secondary-color: #0056b3;
}

.theme-purple {
    --primary-color: #8a2be2;
    --secondary-color: #4b0082;
}

.theme-red {
    --primary-color: #ff4757;
    --secondary-color: #ff3838;
}

.theme-orange {
    --primary-color: #ff7f00;
    --secondary-color: #ff5500;
}

.theme-pink {
    --primary-color: #ff6b8b;
    --secondary-color: #ff4757;
}

/* Responsive */
@media (max-width: 768px) {
    .title {
        font-size: 20px;
    }

    .nav-menu {
        gap: 10px;
    }

    .nav-menu a {
        font-size: 14px;
        padding: 6px 12px;
    }

    .card {
        padding: 30px;
        max-width: 90%;
    }

    .card h2 {
        font-size: 24px;
    }

    .card p, .card li {
        font-size: 14px;
    }

    .autoplay-message h2 {
        font-size: 24px;
    }

    .autoplay-message p {
        font-size: 16px;
    }

    .autoplay-button {
        padding: 15px 30px;
        font-size: 20px;
    }

    .music-player {
        min-width: 250px;
        bottom: 10px;
        right: 10px;
        padding: 10px 15px;
    }

    .player-controls {
        gap: 10px;
    }

    .player-btn {
        font-size: 16px;
    }

    .player-btn.play {
        font-size: 20px;
    }

    .theme-switcher {
        bottom: 10px;
        left: 10px;
    }
    
    .theme-toggle {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
    
    .theme-panel {
        width: 180px;
        padding: 10px;
    }
}