/* ===================================
   SOUND ENGINEERING COURSE LANDING
   Dark, Workshop Aesthetic
   =================================== */

:root {
    /* Colors */
    --bg-primary: #0d0d0f;
    --bg-secondary: #141418;
    --bg-tertiary: #1a1a1f;
    --bg-card: #18181c;
    
    --text-primary: #e8e6e3;
    --text-secondary: #9a9790;
    --text-muted: #5c5a56;
    
    --accent: #c9a66b;
    --accent-light: #dfc291;
    --accent-dark: #8b7345;
    
    --border: #2a2a30;
    --border-light: #3a3a42;
    
    --success: #5a9a6b;
    --error: #9a5a5a;
    
    /* Typography */
    --font-heading: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --section-padding: 120px;
    --container-width: 1100px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 400;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 48px;
    color: var(--text-primary);
}

h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
}

/* CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 40px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: var(--bg-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.02em;
}

.cta-button:hover {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(201, 166, 107, 0.25);
}

/* Telegram Button (Top Right) */
.hero-top-actions {
    position: absolute;
    top: 24px;
    right: 24px;
    z-index: 10;
}

.telegram-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: rgba(13, 13, 15, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 100px;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    transition: all 0.25s ease;
}

.telegram-btn:hover {
    background: rgba(13, 13, 15, 0.85);
    border-color: rgba(255, 255, 255, 0.2);
    color: #fff;
    transform: translateY(-1px);
}

.telegram-btn:focus {
    outline: none;
    box-shadow: 0 0 0 2px rgba(201, 166, 107, 0.5);
}

.telegram-btn svg {
    flex-shrink: 0;
    opacity: 0.85;
}

.telegram-btn:hover svg {
    opacity: 1;
}

.telegram-btn-text {
    white-space: nowrap;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('DSC04130.JPG');
    background-size: cover;
    background-position: center 30%;
    background-repeat: no-repeat;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(180deg, 
            rgba(13, 13, 15, 0.85) 0%, 
            rgba(13, 13, 15, 0.75) 30%,
            rgba(13, 13, 15, 0.85) 70%,
            rgba(20, 20, 24, 0.95) 100%
        ),
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(201, 166, 107, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.04;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: var(--container-width);
    padding: 80px 0;
    animation: fadeInUp 1s ease-out;
}

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

.hero h1 {
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent);
    margin-bottom: 16px;
    font-weight: 400;
    letter-spacing: 0.05em;
}

.hero-lead {
    font-size: 1.15rem;
    line-height: 1.8;
    margin-bottom: 20px;
    max-width: 650px;
}

.hero-start-date {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.03em;
    margin-bottom: 32px;
}

.disclaimer {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-dark);
    padding: 20px 24px;
    margin-bottom: 40px;
    border-radius: 0 4px 4px 0;
}

.disclaimer p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.disclaimer strong {
    color: var(--text-secondary);
}

.disclaimer ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 8px 24px;
}

.disclaimer li {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.disclaimer li::before {
    content: '—';
    margin-right: 8px;
    color: var(--accent-dark);
}

.disclaimer-note {
    margin-top: 12px;
    margin-bottom: 0;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    line-height: 1.5;
    opacity: 0.75;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===================================
   SECTIONS BASE
   =================================== */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    width: 1px;
    height: 60px;
    background: linear-gradient(180deg, transparent 0%, var(--border) 100%);
}

.section h2 {
    text-align: center;
}

/* ===================================
   AUDIENCE SECTION
   =================================== */
.section-audience {
    background: var(--bg-secondary);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.audience-card {
    padding: 40px;
    border-radius: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
}

.audience-card h3 {
    margin-bottom: 24px;
    font-size: 1.3rem;
}

.audience-yes h3 {
    color: var(--success);
}

.audience-no h3 {
    color: var(--error);
}

.audience-card ul {
    list-style: none;
}

.audience-card li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.audience-card li:last-child {
    border-bottom: none;
}

.audience-yes li::before {
    content: '✓';
    margin-right: 12px;
    color: var(--success);
}

.audience-no li::before {
    content: '✕';
    margin-right: 12px;
    color: var(--error);
}

.audience-note {
    margin-top: 40px;
    text-align: center;
    font-size: 0.95rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ===================================
   PHILOSOPHY SECTION
   =================================== */
.section-philosophy {
    background: 
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(201, 166, 107, 0.04) 0%, transparent 50%),
        var(--bg-primary);
}

.philosophy-content {
    max-width: 700px;
    margin: 0 auto;
}

.philosophy-item {
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

.philosophy-item:last-child {
    border-bottom: none;
}

.philosophy-item p {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.6;
    text-align: center;
}

.philosophy-highlight {
    background: var(--bg-tertiary);
    padding: 32px;
    border-radius: 8px;
    border: 1px solid var(--accent-dark);
    margin-top: 16px;
}

.philosophy-highlight p {
    color: var(--accent-light);
    font-size: 1.5rem;
}

/* ===================================
   FORMAT SECTION
   =================================== */
.section-format {
    background: var(--bg-secondary);
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.format-item {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

.format-item:hover {
    border-color: var(--accent-dark);
    transform: translateY(-4px);
}

.format-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--accent);
}

.format-item h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.format-item p {
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===================================
   CTA MID SECTION
   =================================== */
.section-cta-mid {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-secondary) 100%);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-cta-mid::before {
    display: none;
}

.section-cta-mid p {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 32px;
}

/* ===================================
   PROGRAM SECTION
   =================================== */
.section-program {
    background: var(--bg-primary);
}

.program-intro {
    text-align: center;
    font-size: 1.1rem;
    margin-top: -32px;
    margin-bottom: 48px;
}

.accordion {
    max-width: 800px;
    margin: 0 auto;
}

.accordion-item {
    border-bottom: 1px solid var(--border);
}

.accordion-header {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    text-align: left;
    transition: color 0.3s ease;
}

.accordion-header:hover {
    color: var(--accent);
}

.week-label {
    flex-shrink: 0;
    width: 90px;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
}

.week-title {
    flex: 1;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.accordion-icon {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform 0.3s ease;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.accordion-item.active .accordion-content {
    max-height: 400px;
    padding-bottom: 24px;
}

.accordion-content ul {
    list-style: none;
    padding-left: 110px;
}

.accordion-content li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.accordion-content li::before {
    content: '—';
    margin-right: 12px;
    color: var(--accent-dark);
}

.lesson-hint {
    display: block;
    margin-top: 4px;
    padding-left: 24px;
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
    font-style: italic;
}

/* ===================================
   NOT SECTION
   =================================== */
.section-not {
    background: var(--bg-secondary);
    text-align: center;
}

.not-intro {
    margin-top: -32px;
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.not-list {
    list-style: none;
    display: inline-block;
    text-align: left;
}

.not-list li {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 16px;
    padding: 16px 0;
    font-size: 1.1rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.not-list li:last-child {
    border-bottom: none;
}

.not-list svg {
    flex-shrink: 0;
    color: var(--error);
}

.not-hint {
    display: block;
    width: 100%;
    padding-left: 36px;
    margin-top: -4px;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-style: italic;
    line-height: 1.5;
}

.not-conclusion {
    margin-top: 48px;
    padding: 32px;
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-dark);
    border-radius: 8px;
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-style: italic;
    color: var(--accent-light);
    line-height: 1.6;
    text-align: center;
}

/* ===================================
   RESULTS SECTION
   =================================== */
.section-results {
    background: 
        radial-gradient(ellipse 40% 30% at 80% 20%, rgba(201, 166, 107, 0.06) 0%, transparent 50%),
        var(--bg-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    margin-bottom: 60px;
}

.result-item {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.result-number {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 16px;
    line-height: 1;
}

.result-item p {
    font-size: 1.05rem;
    line-height: 1.7;
}

.results-summary {
    text-align: center;
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-style: italic;
    color: var(--text-primary);
    padding: 40px 40px 24px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 0;
}

.results-coda {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    padding: 0 40px 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    margin-top: -1px;
}

/* ===================================
   PARTICIPATION SECTION
   =================================== */
.section-participation {
    background: var(--bg-secondary);
    padding-bottom: 80px;
}

.participation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.participation-details {
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.detail-item:last-child,
.detail-item-last {
    border-bottom: none;
}

.detail-label {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.detail-value {
    color: var(--text-primary);
    font-size: 1.1rem;
}

.detail-value.price {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--accent);
}

.price-split {
    display: block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.7;
    margin-top: 6px;
    line-height: 1.4;
}

.participation-note {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
    line-height: 1.6;
}

.participation-note-subtle {
    margin-top: 8px;
    padding-top: 0;
    border-top: none;
    font-size: 0.8rem;
    opacity: 0.7;
}

.signup-form-container {
    padding: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-dark);
    border-radius: 8px;
}

.signup-form-container h3 {
    margin-bottom: 12px;
}

.signup-form-container > p {
    margin-bottom: 32px;
    font-size: 0.95rem;
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.form-group input {
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color 0.3s ease;
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.cta-submit {
    width: 100%;
    margin-top: 8px;
}

.form-note {
    margin-top: 16px;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}

/* Form Status Messages */
.form-status {
    margin-top: 12px;
    font-size: 0.9rem;
    text-align: center;
    line-height: 1.5;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.form-status:empty {
    display: none;
}

.form-status.success {
    padding: 12px 16px;
    color: var(--success);
    background: rgba(90, 154, 107, 0.1);
    border: 1px solid rgba(90, 154, 107, 0.2);
}

.form-status.error {
    padding: 12px 16px;
    color: #c97b7b;
    background: rgba(154, 90, 90, 0.1);
    border: 1px solid rgba(154, 90, 90, 0.2);
}

/* Form Success State */
.form-success {
    text-align: center;
    padding: 40px 20px;
}

.form-success svg {
    color: var(--success);
    margin-bottom: 20px;
}

.form-success h4 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.form-success p {
    font-size: 0.95rem;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    padding: 40px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 900px) {
    :root {
        --section-padding: 80px;
    }
    
    .audience-grid,
    .results-grid,
    .participation-grid {
        grid-template-columns: 1fr;
    }
    
    .format-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    :root {
        --section-padding: 60px;
    }
    
    html {
        font-size: 15px;
    }
    
    .hero-bg {
        background-position: 60% center;
    }
    
    .hero-bg::before {
        background: 
            linear-gradient(180deg, 
                rgba(13, 13, 15, 0.92) 0%, 
                rgba(13, 13, 15, 0.88) 40%,
                rgba(13, 13, 15, 0.9) 70%,
                rgba(20, 20, 24, 0.98) 100%
            );
    }
    
    .hero-top-actions {
        top: 16px;
        right: 16px;
    }
    
    .telegram-btn {
        padding: 10px 14px;
        font-size: 0.8rem;
    }
    
    .telegram-btn-text {
        display: none;
    }
    
    .telegram-btn svg {
        width: 20px;
        height: 20px;
    }
    
    .hero-content {
        padding: 70px 0 60px;
    }
    
    .hero-scroll {
        display: none;
    }
    
    .disclaimer ul {
        flex-direction: column;
        gap: 4px;
    }
    
    .format-grid {
        grid-template-columns: 1fr;
    }
    
    .format-item {
        text-align: left;
        display: flex;
        gap: 20px;
        align-items: flex-start;
    }
    
    .format-icon {
        margin-bottom: 0;
    }
    
    .accordion-header {
        flex-wrap: wrap;
    }
    
    .week-label {
        width: 100%;
        margin-bottom: -12px;
    }
    
    .accordion-content ul {
        padding-left: 0;
    }
    
    .section h2 {
        margin-bottom: 32px;
    }
    
    .audience-card,
    .participation-details,
    .signup-form-container,
    .result-item {
        padding: 24px;
    }
    
    .results-summary {
        padding: 24px;
        font-size: 1.3rem;
    }
    
    .detail-item {
        flex-direction: column;
        gap: 4px;
    }
}

/* ===================================
   ANIMATIONS
   =================================== */
@media (prefers-reduced-motion: no-preference) {
    .section {
        animation: fadeIn 0.6s ease-out;
    }
    
    @keyframes fadeIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
    
    .audience-card,
    .format-item,
    .result-item {
        transition: transform 0.3s ease, border-color 0.3s ease;
    }
}