/* ==========================================================================
   1. Global Setup & Variables
   ========================================================================== */
:root {
    --primary-color: #0a2540;
    --secondary-color: #dfe9f5; /* Lighter gray for backgrounds */
    --accent-color: #00d4ff;
    --text-color: #333;
    --text-muted: #555;
    --light-text: #f8f9fa;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --admin-color: #6f42c1;
    --border-color: #e0e0e0;
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    background-color: #fff;
    color: var(--text-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}


/* ==========================================================================
   2. Reusable Components
   ========================================================================== */

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    text-align: center;
    border: none;
    transition: transform 0.2s ease, background-color 0.2s ease;
}
.btn:hover { transform: translateY(-3px); }

.btn-primary { background-color: var(--primary-color); color: var(--light-text); }
.btn-primary:hover { background-color: #1a3b5c; }

.btn-secondary { background-color: #6c757d; color: var(--light-text); }
.btn-secondary:hover { background-color: #5a6268; }

.btn-accent { background-color: var(--accent-color); color: var(--primary-color); }

.btn-outline { background: transparent; color: var(--light-text); border: 2px solid var(--light-text); }

.btn-outline-dark { background: transparent; color: var(--primary-color); border: 2px solid var(--primary-color); }
.btn-outline-dark:hover { background: var(--primary-color); color: var(--light-text); }

.btn-block { width: 100%; }
.btn-large { padding: 0.75rem 2rem; font-size: 1.2rem; }


/* --- Cards --- */
.content-card {
    background: #fff;
    border-radius: 10px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
/* Styles for elements inside a content-card */
.content-card h1, .content-card h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}
.content-card p {
    color: #666;
    margin-bottom: 2rem;
}


/* ==========================================================================
   3. Layout: Header, Footer, Navigation
   ========================================================================== */

/* --- Header --- */
.main-header {
    background: #fff;
    border-bottom: 3px solid var(--border-color); /* A simple, clean line */
}
.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.main-header .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

/* --- Navigation --- */
.main-nav .nav-links { display: flex; list-style: none; align-items: center; gap: 2rem; }
.main-nav a { color: var(--text-color); font-weight: 600; text-decoration: none; transition: color 0.2s ease; }
.main-nav a:hover { color: var(--accent-color); }
.main-nav .nav-login { padding: 0.5rem 1.5rem; }
.main-nav a.btn-primary { color: var(--light-text); }
.main-nav a.btn-primary:hover { color: var(--light-text); background-color: #1a3b5c; }

/* --- Hamburger Menu --- */
.hamburger-btn { display: none; flex-direction: column; justify-content: space-around; width: 30px; height: 25px; background: transparent; border: none; cursor: pointer; padding: 0; z-index: 1001; }
.hamburger-line { width: 30px; height: 3px; background-color: var(--primary-color); border-radius: 5px; transition: all 0.3s ease; }

/* --- Footer --- */
.main-footer {
    background-color: var(--primary-color);
    color: var(--light-text);
    text-align: center;
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: var(--light-text);
    text-decoration: none;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        gap: 1rem;
    }
}


/* ==========================================================================
   4. Page-Specific Styles
   ========================================================================== */

/* --- Homepage --- */
.hero { background-color: var(--primary-color); color: var(--light-text); text-align: center; padding: 6rem 0; }
.hero h1 { font-size: 3.5rem; margin-bottom: 1rem; }
.hero p { max-width: 600px; margin: 0 auto 2.5rem auto; opacity: 0.9; }
.how-it-works { padding: 5rem 0; }
.how-it-works-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 3rem; align-items: start; }
.how-item { display: flex; gap: 1.5rem; }
.how-item .icon { font-size: 2rem; color: var(--primary-color); line-height: 1; }
.how-item h3 { font-size: 1.4rem; margin-bottom: 0.5rem; color: var(--primary-color); }
.process-section .section-title { margin: 2rem 0; font-size: 2.5rem; color: var(--primary-color); }
.voice-power-section { background-color: var(--primary-color); color: var(--light-text); padding: 5rem 0; text-align: center; }
.voice-power-section .section-title { color: var(--light-text); }
.voice-power-section .process-description { max-width: 700px; margin: 0 auto 1.5rem auto; font-size: 1.2rem; line-height: 1.8; color: rgba(255, 255, 255, 0.9); }
.voice-power-section .process-cta { font-size: 1.1rem; font-weight: 600; }
.voice-power-section .process-cta a { color: var(--accent-color); text-decoration: underline; text-underline-offset: 4px; }

/* --- Join & Login Pages --- */
.join-container {
    max-width: 500px;
    margin: 4rem auto;
    padding: 0 2rem;
}

.join-card {
    margin-bottom: 0;
}

.btn-join {
    min-width: 200px;
    padding: 1rem 2rem;
}

.login-form { margin-top: 2rem; text-align: left; max-width: 500px; margin-left: auto; margin-right: auto; }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; }
.form-group input, .form-group select { width: 100%; padding: 0.75rem; border: 1px solid #ccc; border-radius: 5px; font-size: 1rem; }
.form-group select { background-color: white; }

/* Two-column form layout for name fields */
.form-row { display: flex; gap: 1rem; margin-bottom: 0; }
.form-group-half { flex: 1; margin-bottom: 1.5rem; }

.error-message { 
    color: var(--danger-color); 
    background: #fbeae5; 
    border: 1px solid var(--danger-color); 
    padding: 1rem; 
    border-radius: 5px; 
    max-width: 500px; 
    margin: 0 auto 1.5rem auto; 
    text-align: left;
}
.code-inputs { display: flex; justify-content: center; gap: 10px; margin-bottom: 2rem; }
.code-input { width: 50px; height: 60px; font-size: 2rem; text-align: center; border: 2px solid #ddd; border-radius: 8px; outline: none; transition: border-color 0.2s; text-transform: uppercase; }
.code-input:focus { border-color: var(--accent-color); box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.25); }

/* Responsive adjustments for login/signup forms */
@media (max-width: 768px) {
    .join-container {
        margin: 2rem auto;
        padding: 0 1rem;
    }
    
    .btn-join {
        width: 100%;
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .login-form { max-width: none; margin-left: 0; margin-right: 0; }
    .error-message { max-width: none; margin-left: 0; margin-right: 0; }
    .form-row { flex-direction: column; gap: 0; }
    .form-group-half { margin-bottom: 1.5rem; }
}

/* --- Teacher Dashboard & Recording Page --- */
.dashboard-container { max-width: 1100px; margin: 3rem auto; padding: 0 2rem; }
.dashboard-container h1 { font-size: 2.8rem; color: var(--primary-color); margin-bottom: 2rem; border-bottom: var(--border-color) solid 2px; padding-bottom: 1rem; }

/* Dashboard Header */
.dashboard-header { margin-bottom: 2rem; }
.dashboard-header-content { 
    display: flex; 
    justify-content: space-between; 
    align-items: flex-start; 
    flex-wrap: wrap; 
    gap: 1rem; 
}
.header-left { flex: 1; min-width: 200px; }
.header-right { text-align: right; flex-shrink: 0; }

.dashboard-top-row { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
.dashboard-top-row .content-card { border: var(--primary-color) solid 2px; border-radius: 8px; }
.dashboard-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.dashboard-grid .content-card { border: var(--primary-color) solid 2px; border-radius: 8px; }
.start-session-panel { max-width: 100%; margin-bottom: 2rem; border: var(--border-color) solid 2px; background: var(--primary-color);}
.start-session-panel.content-card > h2, .start-session-panel.content-card > p, .start-session-panel.content-card > form > div > label { color: var(--light-text); }
.start-session-form { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 1.5rem; margin-top: 2rem; }

/* --- Voice Selection Components --- */
.voice-selection-section { margin-top: 2rem; border-top: 1px solid rgba(255,255,255,0.2); padding-top: 2rem; }
.voice-selection-section h3 { color: var(--light-text); margin-bottom: 1.5rem; font-size: 1.3rem; }

/* Horizontal voice row */
.voice-preview-row { 
    display: flex; 
    gap: 1rem; 
    margin-bottom: 2rem; 
    flex-wrap: wrap;
}

/* Custom voice featured row */
.voice-preview-row.custom-voice-row {
    margin-bottom: 1.5rem;
    justify-content: center;
}

.voice-preview-row.custom-voice-row .voice-option.custom-voice {
    max-width: 400px;
    min-width: 300px;
}

/* Standard voices row */
.voice-preview-row.standard-voices-row {
    margin-bottom: 2rem;
}

.voice-option { 
    flex: 1;
    min-width: 200px;
}

/* Custom voice gets rounded corners */
.voice-option.custom-voice {
    border-radius: 10px;
    overflow: hidden;
}

.voice-label {
    background: rgba(255,255,255,0.1); 
    border: 2px solid rgba(255,255,255,0.2); 
    border-radius: 8px; 
    padding: 1rem; 
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
    height: 100%;
}

/* Custom voice clone styling */
.voice-label.custom-voice-label {
    background: var(--secondary-color);
    border: 2px solid var(--success-color);
}

.voice-label.custom-voice-label .voice-name {
    color: var(--primary-color);
}

.voice-label.custom-voice-label .voice-description {
    color: var(--text-muted);
}

.voice-label:hover { 
    background: rgba(255,255,255,0.15); 
    transform: translateY(-2px);
}

.voice-label.custom-voice-label:hover {
    background: #e8f4f8;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.2);
}

.voice-option.selected .voice-label { 
    background: rgba(0, 212, 255, 0.3); 
    border-color: var(--accent-color); 
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.2);
}

/* Custom voice selected state - override the general selected state */
.voice-option.custom-voice.selected .voice-label.custom-voice-label {
    background: var(--success-color) !important;
    border-color: var(--success-color) !important;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.voice-option.custom-voice.selected .voice-label.custom-voice-label .voice-name {
    color: white !important;
    font-weight: 700;
}

.voice-option.custom-voice.selected .voice-label.custom-voice-label .voice-description {
    color: rgba(255,255,255,0.9) !important;
}

.voice-radio { display: none; }

.voice-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.voice-name { 
    color: var(--light-text); 
    font-size: 1.1rem; 
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.voice-description { 
    color: rgba(255,255,255,0.7); 
    font-size: 0.85rem; 
}

.voice-play-btn { 
    background: var(--accent-color); 
    color: var(--primary-color); 
    border: none; 
    padding: 0.5rem 0.75rem; 
    border-radius: 50%; 
    cursor: pointer; 
    font-size: 1.2rem;
    transition: all 0.3s ease;
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.voice-play-btn:hover { 
    background: #00b8e6;
    transform: scale(1.1); 
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.4); 
}

.voice-play-btn:disabled { 
    opacity: 0.6; 
    cursor: not-allowed; 
    transform: none;
}

/* Responsive design for smaller screens */
@media (max-width: 768px) {
    .voice-preview-row {
        flex-direction: column;
    }
    
    .voice-preview-row.custom-voice-row {
        margin-bottom: 1rem;
    }
    
    .voice-preview-row.custom-voice-row .voice-option.custom-voice {
        max-width: none;
        min-width: unset;
    }
    
    .voice-option {
        min-width: unset;
    }
}

.language-select { font-size: 1.1rem; padding: 0.75rem; border-radius: 5px; border: 1px solid #ccc; min-width: 250px; }
.credits-display { background: var(--secondary-color); border: 1px solid var(--border-color); border-radius: 8px; padding: 1.5rem; margin: 2rem 0; text-align: center; }
.credits-label { font-size: 1rem; font-weight: 600; color: var(--text-muted); margin-top: 0.5rem; }
.credits-value { font-size: 3rem; font-weight: 700; color: var(--primary-color); line-height: 1; }
.dashboard-actions { display: flex; gap: 1rem; justify-content: center; margin-top: 1.5rem; }
.dashboard-actions .btn { flex: 1; }
.session-log { list-style: none; text-align: left; }
.session-log li { 
    padding: 1rem; 
    border-bottom: 1px solid #eee; 
    display: grid; 
    grid-template-columns: 100px 120px 100px 80px 80px; 
    gap: 1rem; 
    align-items: center; 
}
.session-code { font-family: monospace; font-weight: bold; color: var(--primary-color); }
.session-code:hover { 
    background-color: var(--secondary-color); 
    padding: 0.2rem 0.4rem; 
    border-radius: 4px; 
    transition: all 0.2s ease; 
}
.session-date { color: #777; font-size: 0.9rem; }
.session-duration { font-weight: 600; color: var(--text-muted); }
.session-language { 
    background: var(--primary-color); 
    color: white; 
    padding: 0.2rem 0.5rem; 
    border-radius: 4px; 
    font-size: 0.8rem; 
    text-align: center; 
}
.session-voice { 
    background: var(--secondary-color); 
    color: var(--text-muted); 
    padding: 0.2rem 0.5rem; 
    border-radius: 4px; 
    font-size: 0.8rem; 
    text-align: center; 
}

/* Responsive session log */
@media (max-width: 768px) {
    .session-log li { 
        grid-template-columns: 1fr; 
        gap: 0.5rem; 
        text-align: center; 
    }
    .session-log li > span {
        display: block;
        margin-bottom: 0.3rem;
    }
}
.room-info { background-color: var(--secondary-color); padding: 1rem; border-radius: 8px; margin-bottom: 2rem; border: 1px solid var(--border-color); }
.room-info h2 { margin: 0 0 0.5rem 0; font-size: 1.1rem; font-weight: 600; color: var(--text-muted); }
.room-code-value { font-family: monospace; font-weight: bold; font-size: 2.5rem; letter-spacing: 3px; background: #fff; padding: 5px 10px; border-radius: 5px; display: inline-block; }
#recordButton { background-color: var(--success-color); min-width: 250px; }
#recordButton.is-recording, #recordButton:active { background-color: var(--danger-color); transform: scale(1.05); }
#status { margin-top: 1.5rem; font-size: 1.1em; color: var(--text-muted); height: 1.5em; }

/* --- Pricing Page --- */
.pricing-header { text-align: center; padding: 4rem 0 2rem 0; background-color: var(--primary-color); color: var(--light-text); }
.pricing-header h1 { font-size: 2.8rem; }
.pricing-header .subtitle { font-size: 1.2rem; max-width: 700px; margin: 1rem auto;}
.pricing-intro { font-size: 1.1rem; margin: 2rem 0; }
.login-prompt { margin: 1rem 0; color: var(--text-muted); }
.login-prompt a { color: var(--primary-color); font-weight: 600; text-decoration: none; }
.login-prompt a:hover { text-decoration: underline; }
.voice-options-section { padding: 3rem 0; background-color: var(--secondary-color); }
.voice-options-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.voice-option-card { background: #fff; border: 1px solid var(--border-color); border-radius: 10px; padding: 2rem; display: flex; flex-direction: column; }
.voice-option-card h3 { font-size: 1.5rem; color: var(--primary-color); }
.voice-option-card p { margin: 0.5rem 0 1.5rem 0; flex-grow: 1; }
.price-tag { font-size: 1.5rem; font-weight: 700; color: var(--success-color); }
.price-tag.is-addon { color: var(--primary-color); }
.price-tag sup { font-size: 1rem; font-weight: 600; }
.pricing-grid-section { padding: 3rem 0 5rem 0; }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.pricing-card { background: #fff; border: 1px solid var(--border-color); border-radius: 10px; padding: 2rem; text-align: center; transition: transform 0.2s ease, box-shadow 0.2s ease; display: flex; flex-direction: column; }
.pricing-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.08); }
.pricing-card h3 { font-size: 1.5rem; }
.pricing-card .price { font-size: 3rem; font-weight: 700; margin-bottom: 1.5rem; }
.pricing-card ul { list-style: none; margin-bottom: 2rem; flex-grow: 1; }
.pricing-card ul li { padding: 0.5rem 0; border-top: 1px solid #eee; }
.pricing-card .highlight { color: var(--danger-color); }
.pricing-card.is-popular { border-color: var(--accent-color); border-width: 2px; position: relative; transform: scale(1.05); }
.popular-badge { position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background: var(--accent-color); color: var(--primary-color); padding: 5px 15px; border-radius: 20px; font-size: 0.9rem; font-weight: 700; }

/* Teacher.html page */
.language-display { font-size: 1.1rem; font-style: italic; color: var(--text-muted); margin-bottom: 1.5rem !important; }

/* --- FAQ & About Pages --- */
.faq-section, .about-section { padding: 4rem 0 5rem 0; }
.faq-header, .about-header { text-align: center; margin-bottom: 3rem; }
.faq-header h1, .about-header h1 { font-size: 2.8rem; color: var(--primary-color); margin-bottom: 0.5rem; }
.faq-header p, .about-header .subtitle { font-size: 1.2rem; max-width: 600px; margin: 0 auto; color: var(--text-muted); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border-color); }
.faq-question { width: 100%; background: none; border: none; text-align: left; padding: 1.5rem 0; font-size: 1.2rem; font-weight: 600; color: var(--primary-color); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-icon { font-size: 1.5rem; font-weight: 400; transition: transform 0.2s ease; }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease; }
.faq-answer p { padding: 0 1rem 1.5rem 0; line-height: 1.8; }
.faq-item.is-open .faq-answer { max-height: 300px; }
.faq-item.is-open .faq-icon { transform: rotate(45deg); }
.about-content { display: grid; grid-template-columns: 1fr 2fr; gap: 3rem; align-items: start; max-width: 900px; margin: 0 auto; }
.about-image img { width: 100%; border-radius: 50%; box-shadow: 0 5px 20px rgba(0,0,0,0.1); }
.about-text h3 { font-size: 1.5rem; color: var(--primary-color); margin-bottom: 1.5rem; }
.about-text p { margin-bottom: 1.5rem; line-height: 1.8; }
.about-text blockquote { font-size: 1.2rem; font-style: italic; font-weight: 600; color: var(--primary-color); border-left: 4px solid var(--accent-color); padding-left: 1.5rem; margin: 2rem 0; }

/* --- Listen Page --- */
#player { margin-top: 2rem; width: 100%; max-width: 400px; }
.minimal-header { background: #fff; border-bottom: 1px solid var(--border-color); }
.minimal-header .container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
.minimal-header .btn-back { font-weight: 600; color: var(--text-muted); text-decoration: none; padding: 0.5rem 1rem; border: 1px solid transparent; border-radius: 5px; transition: all 0.2s ease; }
.minimal-header .btn-back:hover { color: var(--primary-color); background-color: var(--secondary-color); border-color: #ddd; }

/* ==========================================================================
   6. Responsive Media Queries (All Grouped at the End)
   ========================================================================== */
@media (max-width: 900px) {
    .dashboard-top-row, .dashboard-grid, .how-it-works-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    /* --- Mobile Nav --- */
    .main-nav { display: none; position: absolute; top: 0; left: 0; width: 100%; height: 100vh; background: var(--primary-color); z-index: 1000; }
    .main-nav.mobile-nav-open { display: flex; flex-direction: column; justify-content: center; align-items: center; }
    .main-nav .nav-links { flex-direction: column; gap: 3rem; }
    .main-nav a { color: var(--light-text); font-size: 1.5rem; }
    .main-nav .nav-login { background-color: var(--accent-color); color: var(--primary-color); }
    .hamburger-btn { display: flex; }
    .hamburger-btn.is-active .hamburger-line { background-color: var(--light-text); }
    .hamburger-btn.is-active .hamburger-line:nth-child(1) { transform: translateY(11px) rotate(45deg); }
    .hamburger-btn.is-active .hamburger-line:nth-child(2) { opacity: 0; }
    .hamburger-btn.is-active .hamburger-line:nth-child(3) { transform: translateY(-11px) rotate(-45deg); }
    
    /* --- General Mobile Layouts --- */
    .hero h1 { font-size: 2.5rem; }
    .hero .cta-buttons a { display: block; margin: 1rem 0; }
    .addon-card, .about-content { flex-direction: column; text-align: center; }
    .about-content { grid-template-columns: 1fr; }
    .about-image { max-width: 200px; margin: 0 auto 2rem auto; }
    
    /* --- Mobile Dashboard Improvements --- */
    .start-session-form { gap: 1.5rem; }
    .language-select, .voice-select { 
        font-size: 16px; /* Prevents zoom on iOS */
        padding: 0.8rem; 
    }
    .btn-large { 
        width: 100%; 
        padding: 1.2rem; 
        font-size: 1.1rem; 
    }
    .voice-preview-grid { 
        grid-template-columns: 1fr; 
        gap: 1rem; 
    }
    .voice-preview-card { 
        padding: 1rem; 
    }
    
    /* --- Mobile Dashboard Header --- */
    .dashboard-header-content {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 0.8rem;
    }
    .header-right {
        text-align: left !important;
    }
}