/* ========================================
   MOOD BOT - SPOTIFY-INSPIRED DARK THEME
   Deep Blacks • Neon Green (#1DB954) • Soft Greys
   ======================================== */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Spotify Color Palette */
    --spotify-green: #1DB954;
    --spotify-green-dark: #1AA34A;
    --spotify-green-light: #1ED760;
    --bg-primary: #000000;
    --bg-secondary: #121212;
    --bg-tertiary: #181818;
    --bg-elevated: #282828;
    --text-primary: #FFFFFF;
    --text-secondary: #B3B3B3;
    --text-subdued: #6A6A6A;
    --border-color: #2A2A2A;
    --shadow: rgba(0, 0, 0, 0.5);
    
    /* Typography */
    --font-heading: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, #000000 0%, #0a0a0a 50%, #121212 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* ========================================
   WHATSAPP-STYLE LOGIN SCREEN
   ======================================== */
#login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #000000 0%, #1DB954 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.6s ease;
}

#login-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.login-box {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 40px;
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    border: 1px solid var(--border-color);
    animation: slideUp 0.6s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h2 {
    font-family: var(--font-heading);
    font-size: 28px;
    color: var(--spotify-green);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--spotify-green);
    box-shadow: 0 0 10px rgba(29, 185, 84, 0.3);
}

.login-btn {
    background: var(--spotify-green);
    color: #000;
    border: none;
    border-radius: 8px;
    padding: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
}

.login-btn:hover {
    background: var(--spotify-green-light);
    transform: scale(1.02);
}

.login-btn:active {
    transform: scale(0.98);
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#otp-section {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

#otp-section.hidden {
    display: none;
}

.login-disclaimer {
    text-align: center;
    font-size: 12px;
    color: var(--text-subdued);
    margin-top: 20px;
}

/* Subtle animated background gradient */
body::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(29, 185, 84, 0.03) 0%, transparent 50%);
    animation: rotateGradient 20s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes rotateGradient {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========================================
   LOADING OVERLAY (Model Download Screen)
   ======================================== */
#setup-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(10px);
}

#setup-container.active {
    display: flex;
}

.setup-content {
    text-align: center;
    padding: 40px;
    background: var(--bg-secondary);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 20px 60px var(--shadow);
    max-width: 500px;
    width: 90%;
}

.logo-pulse {
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
    margin-bottom: 20px;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

#status-message {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--spotify-green);
    margin-bottom: 8px;
}

.status-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.progress-wrapper {
    width: 100%;
    height: 8px;
    background-color: var(--bg-elevated);
    border-radius: 10px;
    overflow: hidden;
    margin: 20px 0 10px 0;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

#progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--spotify-green-dark), var(--spotify-green-light));
    border-radius: 10px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(29, 185, 84, 0.5);
}

#progress-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 10px;
}

.tech-badge {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.tech-badge span {
    background: var(--bg-elevated);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* ========================================
   MAIN APP CONTAINER
   ======================================== */
#app-container {
    width: 100%;
    max-width: 900px;
    height: 90vh;
    background: var(--bg-secondary);
    border-radius: 16px;
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

/* ========================================
   HEADER
   ======================================== */
.chat-header {
    background: var(--bg-tertiary);
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.brand-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-elevated);
    border-radius: 12px;
    border: 2px solid var(--spotify-green);
    box-shadow: 0 0 20px rgba(29, 185, 84, 0.3);
}

.brand h1 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.clear-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 10px 18px;
    border-radius: 24px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    transition: all 0.2s ease;
}

.clear-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--spotify-green);
    color: var(--spotify-green);
    transform: translateY(-1px);
}

.clear-btn:active {
    transform: translateY(0);
}

/* Bluetooth Button */
.bluetooth-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 10px 18px;
    border-radius: 24px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    transition: all 0.2s ease;
}

.bluetooth-btn:hover {
    background: var(--bg-elevated);
    border-color: var(--spotify-green);
    color: var(--spotify-green);
    transform: translateY(-1px);
}

.bluetooth-btn:active {
    transform: translateY(0);
}

.bluetooth-btn.connected {
    background: var(--spotify-green);
    border-color: var(--spotify-green);
    color: #000;
}

.bluetooth-btn.connected:hover {
    background: var(--spotify-green-light);
    border-color: var(--spotify-green-light);
}

.bluetooth-status {
    font-size: 0.75rem;
    display: inline-block;
}

.bluetooth-btn.connected .bluetooth-status::before {
    content: '✓ ';
}

/* ========================================
   VIBE PROGRESS BAR
   ======================================== */
#vibe-progress-container {
    width: 100%;
    background: #333;
    height: 8px;
    border-radius: 10px;
    position: relative;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    overflow: hidden;
}

#vibe-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--spotify-green-dark), var(--spotify-green-light));
    width: 100%;
    border-radius: 10px;
    transition: width 1s linear;
    box-shadow: 0 0 10px rgba(29, 185, 84, 0.5);
}

#timer-text {
    position: absolute;
    right: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 600;
    font-family: 'Courier New', monospace;
    z-index: 10;
}

/* ========================================
   VIBE HUB LAUNCH CARD
   ======================================== */
.vibe-hub-launch {
    width: 100%;
    margin-top: 8px;
}

.vibe-hub-card {
    background: linear-gradient(135deg, var(--bg-elevated) 0%, rgba(29, 185, 84, 0.1) 100%);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin-top: 8px;
    box-shadow: 0 4px 12px rgba(29, 185, 84, 0.15);
}

.vibe-hub-buttons {
    display: flex;
    gap: 12px;
    flex-direction: column;
}

.vibe-hub-btn {
    background: var(--spotify-green);
    color: #000;
    border: none;
    padding: 12px 16px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    font-family: var(--font-body);
}

.vibe-hub-btn:hover {
    background: var(--spotify-green-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(29, 185, 84, 0.3);
}

.vibe-hub-btn:active {
    transform: translateY(0);
}

/* ========================================
   TIMER DISPLAY (OLD - KEPT FOR COMPATIBILITY)
   ======================================== */
.timer-container {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    margin-left: 12px;
}

.timer-display {
    font-family: 'Courier New', monospace;
    font-size: 18px;
    font-weight: 700;
    color: var(--spotify-green);
    min-width: 40px;
    text-align: center;
    animation: timerPulse 1s ease-in-out infinite;
}

.timer-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

@keyframes timerPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

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

/* ========================================
   CHAT MESSAGES AREA
   ======================================== */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: var(--bg-primary);
}

/* Custom Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--bg-elevated);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--spotify-green);
}

/* ========================================
   MESSAGE BUBBLES (Minimalist Style)
   ======================================== */
.message {
    display: flex;
    gap: 12px;
    animation: messageSlideIn 0.3s ease;
    max-width: 85%;
}

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

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.bot-avatar {
    background: var(--bg-elevated);
    border: 2px solid var(--spotify-green);
}

.user-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: 2px solid #667eea;
}

.message-content {
    background: var(--bg-tertiary);
    padding: 14px 18px;
    border-radius: 18px;
    border: 1px solid var(--border-color);
    line-height: 1.6;
    font-size: 0.95rem;
}

.bot-message .message-content {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--spotify-green);
}

.user-message {
    flex-direction: row-reverse;
    align-self: flex-end;
}

.user-message .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    border: none;
}

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

/* Playlist Link Styling */
.playlist-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--spotify-green);
    color: #000;
    padding: 10px 20px;
    border-radius: 24px;
    border: none;
    font-weight: 600;
    margin-top: 12px;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(29, 185, 84, 0.3);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.95rem;
}

.playlist-link:hover {
    background: var(--spotify-green-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(29, 185, 84, 0.5);
}

.playlist-link:active {
    transform: translateY(0);
}

.playlist-link::before {
    content: '🎵 ';
    font-size: 1.2rem;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 14px 18px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--spotify-green);
    animation: typingBounce 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-10px); }
}

/* ========================================
   QUIZ OPTIONS & VIBE CARD
   ======================================== */

/* Quiz Options Container */
.opt-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 12px;
}

.quiz-opt {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: var(--font-body);
    font-size: 14px;
    text-align: left;
}

.quiz-opt:hover {
    background: var(--bg-elevated);
    border-color: var(--spotify-green);
    transform: translateX(4px);
}

.quiz-opt:active {
    transform: translateX(2px);
}

/* Vibe Card */
.vibe-card {
    background: linear-gradient(135deg, var(--bg-elevated) 0%, var(--bg-tertiary) 100%);
    border: 2px solid var(--spotify-green);
    border-radius: 16px;
    padding: 20px;
    margin-top: 12px;
    text-align: center;
}

.vibe-card p {
    margin-bottom: 16px;
    font-size: 15px;
    color: var(--text-primary);
}

.vibe-card strong {
    color: var(--spotify-green);
    font-size: 18px;
}

.btn-container {
    display: flex;
    gap: 12px;
    flex-direction: column;
    margin-top: 16px;
}

.btn-container button {
    display: block;
    width: 100%;
    background: linear-gradient(135deg, var(--spotify-green) 0%, var(--spotify-green-light) 100%);
    color: #000;
    border: none;
    border-radius: 12px;
    padding: 12px 24px;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(29, 185, 84, 0.4);
    font-family: var(--font-body);
}

.btn-container button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 28px rgba(29, 185, 84, 0.6);
}

.app-btn:active {
    transform: translateY(-1px);
}

/* ========================================
   INPUT AREA
   ======================================== */
.input-container {
    padding: 20px 24px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
    background: var(--bg-elevated);
    border-radius: 28px;
    padding: 6px 6px 6px 20px;
    border: 2px solid transparent;
    transition: border-color 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--spotify-green);
    box-shadow: 0 0 0 3px rgba(29, 185, 84, 0.1);
}

#user-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-body);
    padding: 12px 0;
}

#user-input::placeholder {
    color: var(--text-subdued);
}

.send-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--spotify-green);
    border: none;
    color: #000;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.send-btn:hover {
    background: var(--spotify-green-light);
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(29, 185, 84, 0.4);
}

.send-btn:active {
    transform: scale(0.95);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-subdued);
    margin-top: 12px;
    text-align: center;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 768px) {
    #app-container {
        max-width: 100%;
        height: 100vh;
        border-radius: 0;
    }
    
    .brand h1 {
        font-size: 1.25rem;
    }
    
    .clear-btn span {
        display: none;
    }
    
    .message {
        max-width: 90%;
    }
    
    .setup-content {
        width: 95%;
        padding: 30px 20px;
    }
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.hidden {
    display: none !important;
}

.fade-out {
    animation: fadeOut 0.5s ease forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        visibility: hidden;
    }
}