/* ==========================================================================
   PREMIUM DESIGN SYSTEM - PVLAICORP.RU (v5.0 - Rhythm & Contrast)
   Strict Alternating Dark / Light Sections + Interactive Sound + 3 Cases + Testimonials
   ========================================================================== */

:root {
    --bg-dark-hero: #070913;
    --bg-dark-section: #0B0F19;
    --bg-dark-card: rgba(255, 255, 255, 0.04);
    --bg-dark-border: rgba(255, 255, 255, 0.08);
    
    --bg-light-pure: #FFFFFF;
    --bg-light-slate: #F8FAFC;
    --bg-light-warm: #F5F5F4;
    
    --teal-primary: #0D9488;
    --teal-hover: #0F766E;
    --teal-glow: rgba(13, 148, 136, 0.25);
    
    --cyan-accent: #0EA5E9;
    --violet-accent: #8B5CF6;
    --pink-accent: #EC4899;
    --amber-star: #D97706;
    
    --text-dark: #111827;
    --text-muted: #6B7280;
    --text-sub: #9CA3AF;
    
    --text-light-head: #FFFFFF;
    --text-light-body: rgba(255, 255, 255, 0.72);
    --text-light-muted: rgba(255, 255, 255, 0.5);
    
    --border-light: #E5E7EB;
    --border-subtle: #F3F4F6;
    
    --font-heading: 'Outfit', 'Plus Jakarta Sans', -apple-system, sans-serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, sans-serif;
    
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
    --shadow-dark-card: 0 20px 50px rgba(0, 0, 0, 0.4);
    --shadow-highlight: 0 20px 40px -10px rgba(13, 148, 136, 0.2);
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark-hero);
    color: var(--text-dark);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Base Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s var(--ease-out);
    text-decoration: none;
    border: none;
    outline: none;
}

.btn:active {
    transform: scale(0.97);
}

.btn-gradient {
    background: linear-gradient(135deg, var(--teal-primary) 0%, var(--cyan-accent) 100%);
    color: #ffffff;
    padding: 14px 28px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(13, 148, 136, 0.25);
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(13, 148, 136, 0.35);
}

/* ==========================================================================
   HEADER (Single-row sleek navbar)
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 64px;
    z-index: 1000;
    transition: all 0.3s var(--ease-out);
    background: rgba(7, 9, 19, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.header.scrolled {
    background: rgba(7, 9, 19, 0.95);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: 16px;
    flex-wrap: nowrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #ffffff;
    white-space: nowrap;
    flex-shrink: 0;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan-accent);
}

.logo-name {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.nav-desktop {
    display: flex;
    align-items: center;
    flex-shrink: 1;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
    list-style: none;
    white-space: nowrap;
    flex-wrap: nowrap;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.2s;
    white-space: nowrap;
}

.nav-links a:hover {
    color: #ffffff;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    white-space: nowrap;
}

.btn-nav-gradient {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    padding: 7px 16px;
    border-radius: 9999px;
    font-size: 12.5px;
    font-weight: 600;
    backdrop-filter: blur(8px);
    white-space: nowrap;
    transition: all 0.2s;
}

.btn-nav-gradient:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.3);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    height: calc(100vh - 64px);
    background: rgba(7, 9, 19, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 999;
    display: none;
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.mobile-menu-overlay.active {
    display: flex;
    animation: fadeIn 0.25s var(--ease-out);
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.mobile-nav-links a {
    color: #ffffff;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    display: block;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.mobile-nav-links a:hover {
    color: var(--cyan-accent);
}

@media (max-width: 992px) {
    .nav-desktop { display: none !important; }
    .menu-toggle { display: block !important; }
}

/* ==========================================================================
   SECTION COLOR THEMES (ALTERNATNG RHYTHM)
   ========================================================================== */
.section-py {
    padding: 90px 0;
}

/* Light Theme Section */
.theme-light {
    background-color: #FFFFFF;
    color: var(--text-dark);
}

.theme-light-warm {
    background-color: #F5F5F4;
    color: var(--text-dark);
    border-top: 1px solid #E7E5E4;
    border-bottom: 1px solid #E7E5E4;
}

/* Dark Theme Section */
.theme-dark {
    background-color: #0B0F19;
    color: #FFFFFF;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.theme-dark-deep {
    background-color: #070913;
    color: #FFFFFF;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* Section Headers */
.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 50px auto;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(14, 165, 233, 0.1);
    color: var(--cyan-accent);
    font-size: 12px;
    font-weight: 700;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 14px;
}

.section-tag.teal-tag {
    background: rgba(13, 148, 136, 0.12);
    color: var(--teal-primary);
}

.theme-dark .section-tag.teal-tag {
    background: rgba(13, 148, 136, 0.25);
    color: #2DD4BF;
    border: 1px solid rgba(45, 212, 191, 0.3);
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 12px;
    color: inherit;
}

.theme-light .section-header h2 {
    color: var(--text-dark);
}

.theme-dark .section-header h2 {
    color: #FFFFFF;
}

.section-header p {
    font-size: 16px;
    line-height: 1.55;
}

.theme-light .section-header p {
    color: var(--text-muted);
}

.theme-dark .section-header p {
    color: rgba(255, 255, 255, 0.65);
}

/* ==========================================================================
   1. HERO SECTION WITH WEBGL SHADER
   ========================================================================== */
.hero-webgl-section {
    position: relative;
    width: 100%;
    min-height: 680px;
    background-color: var(--bg-dark-hero);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 105px;
    padding-bottom: 70px;
}

.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.hero-canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(7, 9, 19, 0.35);
    z-index: 2;
    pointer-events: none;
}

.hero-webgl-container {
    position: relative;
    z-index: 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-badge-wrap {
    margin-bottom: 24px;
}

.hero-pill-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 8px 20px;
    border-radius: 9999px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: #10B981;
    border-radius: 50%;
    box-shadow: 0 0 10px #10B981;
    animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.6; }
}

.badge-text {
    font-size: 13px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
    letter-spacing: -0.01em;
}

.hero-audience-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 28px;
    background: rgba(255, 255, 255, 0.06);
    padding: 4px;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(12px);
    flex-wrap: wrap;
    justify-content: center;
}

.aud-tab-btn {
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.aud-tab-btn:hover {
    color: #ffffff;
}

.aud-tab-btn.active {
    background: rgba(255, 255, 255, 0.18);
    color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-segment-content {
    display: none;
    max-width: 960px;
    margin: 0 auto;
}

.hero-segment-content.active {
    display: block;
    animation: fadeInScale 0.4s var(--ease-out);
}

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

.hero-main-title {
    font-family: var(--font-heading);
    font-size: 56px;
    font-weight: 700;
    color: #ffffff;
    line-height: 1.08;
    letter-spacing: -0.035em;
    margin-bottom: 20px;
}

.gradient-text-teal {
    background: linear-gradient(135deg, #2DD4BF 0%, #38BDF8 50%, #A78BFA 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-main-subtitle {
    font-size: 17px;
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
    max-width: 640px;
    margin: 0 auto 36px auto;
    line-height: 1.6;
}

.hero-cta-row {
    display: flex;
    gap: 16px;
    justify-content: center;
    align-items: center;
    margin-bottom: 44px;
    flex-wrap: wrap;
}

.btn-hero-primary {
    background: #ffffff;
    color: #0F172A;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 700;
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.btn-hero-primary:hover {
    background: #F8FAFC;
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(255, 255, 255, 0.3);
}

.btn-hero-secondary {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: rgba(255, 255, 255, 0.85);
    padding: 16px 28px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.3);
}

.hero-trust-line {
    display: flex;
    gap: 32px;
    justify-content: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 13.5px;
    flex-wrap: wrap;
}

.trust-badge-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.trust-check {
    color: #2DD4BF;
    font-weight: 800;
}

/* ==========================================================================
   2. AUDIO STUDIO (THEME DARK)
   ========================================================================== */
.audio-player-glass-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(139, 92, 246, 0.25);
    border-radius: 24px;
    padding: 32px;
    max-width: 900px;
    margin: 40px auto 50px auto;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
}

.player-top-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.track-badge {
    display: inline-block;
    background: rgba(139, 92, 246, 0.2);
    color: #C084FC;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.track-title {
    font-size: 18px;
    font-weight: 700;
    color: #ffffff;
}

.btn-play-pause {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--teal-primary) 0%, var(--violet-accent) 100%);
    border: none;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.4);
    transition: all 0.2s var(--ease-out);
}

.btn-play-pause:hover {
    transform: scale(1.08);
}

.btn-play-pause svg {
    width: 22px;
    height: 22px;
}

.waveform-visualizer {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 90px;
    padding: 10px 0;
    margin-bottom: 20px;
    overflow: hidden;
}

.wave-bar {
    flex: 1;
    min-width: 3px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.18);
    transition: height 0.12s ease, background-color 0.2s;
}

.wave-bar.active-bar {
    background: linear-gradient(to top, var(--pink-accent), var(--teal-primary));
    box-shadow: 0 0 10px rgba(236, 72, 153, 0.4);
}

.player-bottom-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 18px;
    flex-wrap: wrap;
    gap: 12px;
}

.time-readout {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    font-variant-numeric: tabular-nums;
}

.audio-track-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.track-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    padding: 6px 14px;
    border-radius: 16px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.track-btn.active {
    background: rgba(139, 92, 246, 0.35);
    border-color: rgba(139, 92, 246, 0.6);
    color: #ffffff;
}

.studio-features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.studio-feat-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 18px;
    padding: 24px;
    text-align: left;
}

.feat-icon-box {
    font-size: 28px;
    margin-bottom: 12px;
}

.studio-feat-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 8px;
}

.studio-feat-card p {
    font-size: 13.5px;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

/* ==========================================================================
   3. DIGITAL TWIN (THEME LIGHT)
   ========================================================================== */
.twin-split-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 50px;
    align-items: center;
    background: #ffffff;
    border: 1px solid var(--border-light);
    border-radius: 24px;
    padding: 48px;
    box-shadow: var(--shadow-card);
}

.twin-bullets-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.twin-bullet-item {
    display: flex;
    gap: 12px;
}

.bullet-check {
    color: var(--teal-primary);
    font-weight: 800;
    font-size: 18px;
    line-height: 1.2;
}

.twin-bullet-item strong {
    display: block;
    font-size: 15px;
    color: var(--text-dark);
    margin-bottom: 2px;
}

.twin-bullet-item span {
    font-size: 13.5px;
    color: var(--text-muted);
}

.video-preview-wrapper {
    background: #000000;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-light);
}

.twin-video {
    width: 100%;
    display: block;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.video-caption-bar {
    background: #ffffff;
    padding: 14px 18px;
    font-size: 12.5px;
    color: var(--text-muted);
    font-weight: 600;
    border-top: 1px solid var(--border-light);
    text-align: center;
}

/* ==========================================================================
   4. CHAT SIMULATOR (THEME DARK)
   ========================================================================== */
.chat-sim-card-dark {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 36px;
    max-width: 860px;
    margin: 0 auto;
    box-shadow: var(--shadow-dark-card);
    backdrop-filter: blur(20px);
}

.chat-header-dark {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 16px;
    margin-bottom: 20px;
}

.chat-avatar-status {
    display: flex;
    align-items: center;
    gap: 14px;
}

.chat-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--teal-primary);
}

.chat-status strong {
    display: block;
    font-size: 15px;
    color: #FFFFFF;
}

.chat-status span {
    font-size: 12px;
    color: #10B981;
    font-weight: 600;
}

.chat-messages {
    min-height: 140px;
    max-height: 260px;
    overflow-y: auto;
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-bubble {
    padding: 14px 20px;
    border-radius: 18px;
    font-size: 14.5px;
    line-height: 1.5;
    max-width: 85%;
}

.chat-bubble.bot-msg-dark {
    background: rgba(255, 255, 255, 0.07);
    color: rgba(255, 255, 255, 0.9);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.chat-bubble.user-msg {
    background: linear-gradient(135deg, var(--teal-primary), var(--cyan-accent));
    color: #ffffff;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(13, 148, 136, 0.3);
}

.chat-options-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.chat-opt-btn-dark {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.85);
    padding: 10px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.chat-opt-btn-dark:hover {
    background: var(--teal-primary);
    color: #ffffff;
    border-color: var(--teal-primary);
    box-shadow: 0 4px 15px rgba(13, 148, 136, 0.3);
}

/* ==========================================================================
   5. WHY US (THEME LIGHT)
   ========================================================================== */
.why-grid {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 30px;
}

.why-card {
    border-radius: 24px;
    padding: 36px;
    background: #ffffff;
}

.red-border-card {
    border: 1px solid #FECDD3;
    background: rgba(254, 242, 242, 0.4);
}

.green-border-card {
    border: 2px solid var(--teal-primary);
    background: #ffffff;
    box-shadow: var(--shadow-highlight);
}

.why-badge-red {
    display: inline-block;
    color: #E11D48;
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 20px;
}

.why-badge-green {
    display: inline-block;
    color: var(--teal-primary);
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 20px;
}

.why-list-clean {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
    font-size: 14.5px;
    color: #374151;
    line-height: 1.55;
}

/* ==========================================================================
   6. USECASES (THEME DARK)
   ========================================================================== */
.usecase-card-dark {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-dark-card);
}

.usecase-tabs-top-dark {
    display: flex;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.usecase-tab-btn-dark {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 13.5px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.usecase-tab-btn-dark.active {
    background: var(--teal-primary);
    color: #ffffff;
    border-color: var(--teal-primary);
    box-shadow: 0 4px 15px rgba(13, 148, 136, 0.3);
}

.usecase-content-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    align-items: center;
}

.usecase-info h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 12px;
    color: #FFFFFF;
}

.usecase-desc {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.65);
    margin-bottom: 24px;
    line-height: 1.6;
}

.usecase-bullet-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.usecase-bullet {
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.bullet-icon {
    color: #2DD4BF;
    font-size: 18px;
    line-height: 1.2;
}

.usecase-badge {
    display: inline-block;
    background: rgba(45, 212, 191, 0.15);
    color: #2DD4BF;
    padding: 2px 8px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    border: 1px solid rgba(45, 212, 191, 0.2);
}

.usecase-metrics-box-dark {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 28px;
}

.usecase-metric-item {
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

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

.metric-val {
    font-size: 26px;
    font-weight: 800;
    color: #2DD4BF;
}

.metric-lbl {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.55);
}

.usecase-footer-action-dark {
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px dashed rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 15px;
    color: #FFFFFF;
    font-weight: 600;
}

/* ==========================================================================
   7. PROJECTS SLIDER SECTION (THEME LIGHT)
   ========================================================================== */
.project-slider-nav {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.proj-tab-btn {
    background: #F1F5F9;
    border: 1px solid var(--border-light);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 700;
    color: #475569;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.25s var(--ease-out);
}

.proj-tab-btn .p-num {
    background: rgba(0, 0, 0, 0.08);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 800;
}

.proj-tab-btn:hover {
    background: #E2E8F0;
    color: var(--text-dark);
}

.proj-tab-btn.active {
    background: var(--text-dark);
    color: #ffffff;
    border-color: var(--text-dark);
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.2);
}

.proj-tab-btn.active .p-num {
    background: var(--teal-primary);
    color: #ffffff;
}

.project-display-card {
    background: #ffffff;
    border: 1px solid var(--border-light);
    border-radius: 24px;
    padding: 44px;
    box-shadow: var(--shadow-card);
    max-width: 1150px;
    margin: 0 auto;
}

.project-slide-item {
    display: none;
}

.project-slide-item.active {
    display: block;
    animation: fadeInScale 0.35s var(--ease-out);
}

.case-study-grid {
    display: grid;
    grid-template-columns: 1.25fr 1fr;
    gap: 44px;
}

.case-badges-row {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.tag-badge-violet {
    background: rgba(139, 92, 246, 0.1);
    color: var(--violet-accent);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
}

.tag-badge-green {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
}

.case-study-content h3 {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 12px;
}

.case-desc {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.6;
}

.case-solutions-block h4 {
    font-size: 14px;
    text-transform: uppercase;
    font-weight: 800;
    color: #10B981;
    margin-bottom: 12px;
}

.case-solutions-block ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 13.5px;
    color: #374151;
}

.stats-grid-2x2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 24px;
}

.stat-box {
    background: #F8FAFC;
    border: 1px solid var(--border-light);
    padding: 16px;
    border-radius: 16px;
    text-align: center;
}

.stat-number {
    font-size: 22px;
    font-weight: 800;
    color: var(--cyan-accent);
}

.stat-label {
    font-size: 11.5px;
    color: var(--text-muted);
    margin-top: 4px;
}

.case-live-links {
    background: rgba(14, 165, 233, 0.04);
    border: 1px dashed rgba(14, 165, 233, 0.3);
    padding: 20px;
    border-radius: 20px;
}

.links-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--cyan-accent);
    margin-bottom: 12px;
}

.links-row {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn-sm-tg {
    background: linear-gradient(135deg, var(--teal-primary), var(--cyan-accent));
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 12.5px;
    text-decoration: none;
    border: none;
    cursor: pointer;
}

.btn-sm-outline {
    background: #ffffff;
    border: 1px solid var(--border-light);
    color: var(--text-dark);
    padding: 8px 14px;
    border-radius: 20px;
    font-size: 12.5px;
    text-decoration: none;
    cursor: pointer;
}

/* ==========================================================================
   8. ROADMAP TABS (THEME DARK)
   ========================================================================== */
.tabs-container {
    max-width: 960px;
    margin: 0 auto;
}

.tabs-header-dark {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn-dark {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn-dark.active {
    background: var(--teal-primary);
    color: #ffffff;
    border-color: var(--teal-primary);
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.35);
}

.tab-panel-dark {
    display: none;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-dark-card);
}

.tab-panel-dark.active {
    display: block;
    animation: fadeInScale 0.3s var(--ease-out);
}

.tab-panel-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 36px;
    align-items: center;
}

.tab-info h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 12px;
    color: #FFFFFF;
}

.tab-info p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.65);
    margin-bottom: 20px;
    line-height: 1.6;
}

.tab-info ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tab-info li {
    position: relative;
    padding-left: 24px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.85);
}

.tab-info li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #2DD4BF;
    font-weight: 800;
}

.tab-image {
    width: 100%;
    border-radius: 16px;
    display: block;
    object-fit: cover;
}

/* ==========================================================================
   9. TESTIMONIALS SECTION (THEME LIGHT WARM)
   ========================================================================== */
.testimonials-cards-row {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 24px;
    max-width: 1060px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.testimonial-card {
    width: 320px;
    flex-shrink: 0;
    background: #FFFFFF;
    border: 1px solid #E7E5E4;
    border-radius: 18px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}

.testimonial-card.rotate-left {
    transform: rotate(-2deg);
}

.testimonial-card.rotate-right {
    transform: rotate(1deg);
}

.testimonial-card.rotate-subtle {
    transform: rotate(-1.5deg);
}

.testimonial-card:hover {
    transform: rotate(0deg) translateY(-8px) scale(1.02);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.stars-row {
    display: flex;
    gap: 3px;
    margin-bottom: 14px;
}

.star-svg {
    width: 15px;
    height: 15px;
}

.quote-text {
    font-size: 14px;
    color: #374151;
    line-height: 1.6;
    margin-bottom: 20px;
}

.person-info-row {
    display: flex;
    align-items: center;
    gap: 12px;
    border-top: 1px solid #F3F4F6;
    padding-top: 14px;
    margin-top: auto;
}

.avatar-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

.person-name {
    font-size: 13.5px;
    font-weight: 700;
    color: #111827;
}

.person-role {
    font-size: 12px;
    color: #6B7280;
}

/* ==========================================================================
   10. PRICING SECTION (THEME LIGHT PURE)
   ========================================================================== */
.pricing-cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 28px;
    max-width: 1150px;
    margin: 0 auto 50px auto;
}

.pricing-card-clean {
    background: #ffffff;
    border-radius: 20px;
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--border-light);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    position: relative;
    transition: transform 0.25s var(--ease-out), box-shadow 0.25s var(--ease-out);
}

.pricing-card-clean:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.06);
}

.pricing-card-clean.highlighted-card {
    border: 2px solid var(--teal-primary);
    box-shadow: var(--shadow-highlight);
}

.badge-most-popular {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--teal-primary);
    color: #ffffff;
    font-size: 11px;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.plan-header {
    text-align: left;
}

.plan-name {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.plan-price-row {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.plan-price {
    font-size: 42px;
    font-weight: 800;
    color: var(--text-dark);
    letter-spacing: -0.03em;
    line-height: 1;
}

.plan-currency {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-muted);
}

.plan-sub-period {
    font-size: 13px;
    color: var(--teal-primary);
    font-weight: 600;
    margin-top: 6px;
    margin-bottom: 12px;
}

.plan-description {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.5;
    min-height: 42px;
}

.plan-divider {
    height: 1px;
    background: var(--border-subtle);
    margin: 20px 0;
}

.plan-features-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
    text-align: left;
}

.plan-features-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13.5px;
    color: #374151;
    line-height: 1.45;
}

.check-icon-svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
}

.btn-plan-outline {
    width: 100%;
    height: 46px;
    background: #ffffff;
    border: 1px solid var(--border-light);
    color: var(--text-dark);
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
}

.btn-plan-outline:hover {
    border-color: var(--teal-primary);
    color: var(--teal-primary);
}

.btn-plan-highlighted {
    width: 100%;
    height: 46px;
    background: var(--teal-primary);
    border: none;
    color: #ffffff;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 6px 20px rgba(13, 148, 136, 0.3);
}

.btn-plan-highlighted:hover {
    background: var(--teal-hover);
}

/* Hourly Mentorship Banner */
.mentorship-banner-clean {
    background: #ffffff;
    border: 1px solid rgba(139, 92, 246, 0.35);
    border-radius: 24px;
    padding: 36px;
    max-width: 1150px;
    margin: 0 auto 36px auto;
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.06);
}

.mentorship-banner-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.mentorship-banner-info {
    flex: 1.4;
    text-align: left;
}

.banner-badge-violet {
    display: inline-block;
    background: rgba(139, 92, 246, 0.1);
    color: var(--violet-accent);
    padding: 4px 14px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 12px;
}

.mentorship-banner-info h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 10px;
}

.mentorship-banner-info p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.55;
    margin-bottom: 18px;
}

.mentorship-points-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    font-size: 13px;
    color: #374151;
}

.m-check {
    color: var(--violet-accent);
    font-weight: 800;
}

.mentorship-banner-action {
    flex: 0.6;
    background: #F8FAFC;
    border: 1px solid var(--border-light);
    padding: 24px;
    border-radius: 20px;
    text-align: center;
}

.rate-price {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-dark);
}

.rate-curr {
    font-size: 16px;
    color: var(--text-muted);
    font-weight: 600;
}

.rate-sub {
    font-size: 12px;
    color: var(--text-muted);
    margin: 4px 0 16px 0;
}

/* Guarantee Box */
.guarantee-box-clean {
    background: rgba(16, 185, 129, 0.04);
    border: 1px dashed rgba(16, 185, 129, 0.3);
    border-radius: 20px;
    padding: 24px 30px;
    max-width: 1150px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 20px;
}

.guarantee-icon {
    font-size: 36px;
}

.guarantee-text h4 {
    font-size: 16px;
    font-weight: 800;
    color: #10B981;
    margin-bottom: 4px;
}

.guarantee-text p {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

/* ==========================================================================
   11. FAQ ACCORDION (THEME DARK DEEP)
   ========================================================================== */
.faq-container {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item-dark {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.2s;
}

.faq-question-dark {
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    text-align: left;
    font-size: 16px;
    font-weight: 700;
    color: #FFFFFF;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-icon-dark {
    font-size: 22px;
    color: #2DD4BF;
    transition: transform 0.2s;
}

.faq-item-dark.active .faq-icon-dark {
    transform: rotate(45deg);
}

.faq-answer-dark {
    display: none;
    padding: 0 24px 20px 24px;
    font-size: 14.5px;
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.6;
}

.faq-item-dark.active .faq-answer-dark {
    display: block;
}

/* ==========================================================================
   12. ULTRA-MINIMAL FOOTER (THEME DARK DEEP)
   ========================================================================== */
.footer-ultra-minimal-dark {
    background-color: #05070E;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 36px 0 24px 0;
}

.footer-container-minimal {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.footer-main-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand-side {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-circle-logo {
    display: flex;
    align-items: center;
    color: var(--cyan-accent);
}

.footer-brand-name-dark {
    font-size: 14px;
    font-weight: 600;
    color: #FFFFFF;
    letter-spacing: -0.01em;
}

.footer-nav-center-dark {
    display: flex;
    gap: 28px;
    list-style: none;
}

.footer-nav-center-dark a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.2s;
}

.footer-nav-center-dark a:hover {
    color: #FFFFFF;
}

.footer-social-icons-dark {
    display: flex;
    gap: 16px;
    align-items: center;
}

.footer-social-icons-dark a {
    color: rgba(255, 255, 255, 0.4);
    transition: color 0.2s;
    display: flex;
}

.footer-social-icons-dark a:hover {
    color: #2DD4BF;
}

.footer-copyright-row-dark {
    text-align: center;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.3);
    padding-top: 12px;
}

/* ==========================================================================
   MODAL WINDOWS & TOAST
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(7, 9, 19, 0.75);
    backdrop-filter: blur(12px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.2s var(--ease-out);
}

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

.modal-window {
    background: #ffffff;
    border: 1px solid var(--border-light);
    border-radius: 24px;
    padding: 36px;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
    position: relative;
}

.close-modal-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: #F1F5F9;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-window h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
    color: #111827;
}

.modal-window p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 14px;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 12.5px;
    font-weight: 600;
    color: #374151;
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-light);
    border-radius: 12px;
    font-size: 14px;
    font-family: var(--font-body);
    outline: none;
    transition: border-color 0.2s;
}

.form-input:focus {
    border-color: var(--teal-primary);
}

textarea.form-input {
    min-height: 80px;
    resize: vertical;
}

.submit-btn {
    width: 100%;
    height: 48px;
    margin-top: 10px;
}

.modal-divider {
    position: relative;
    text-align: center;
    margin: 18px 0;
    font-size: 12px;
    color: var(--text-sub);
}

.modal-divider span {
    background: #ffffff;
    padding: 0 10px;
    position: relative;
    z-index: 1;
}

.modal-divider hr {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    border: 0;
    border-top: 1px dashed var(--border-light);
}

.btn-telegram {
    background: #0088cc;
    color: #ffffff;
    padding: 12px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    width: 100%;
}

.toast-notification {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: #10B981;
    color: #ffffff;
    padding: 16px 24px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
    z-index: 3000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.4s var(--ease-out);
}

.toast-notification.active {
    transform: translateY(0);
    opacity: 1;
}

/* ==========================================================================
   RESPONSIVE ADAPTATIONS
   ========================================================================== */
@media (max-width: 1024px) {
    .pricing-cards-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
    }
    .twin-split-grid, .why-grid, .usecase-content-grid, .tab-panel-grid, .case-study-grid {
        grid-template-columns: 1fr;
    }
    .mentorship-banner-content {
        flex-direction: column;
    }
    .mentorship-banner-action {
        width: 100%;
    }
    .studio-features-grid {
        grid-template-columns: 1fr;
    }
    .testimonials-cards-row {
        flex-direction: column;
        align-items: center;
    }
    .testimonial-card {
        transform: none !important;
        width: 100%;
        max-width: 420px;
    }
}

@media (max-width: 768px) {
    .hero-main-title {
        font-size: 38px;
    }
    .hero-main-subtitle {
        font-size: 15px;
    }
    .section-py {
        padding: 60px 0;
    }
    .footer-main-row {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
    .footer-nav-center-dark {
        flex-wrap: wrap;
        justify-content: center;
    }
}