:root {
    --bg-primary: #0B0F19;
    --bg-secondary: #111827;
    --bg-card: #1F2937;
    --bg-card-hover: #283548;
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --accent-blue: #00ADB5;
    --accent-cyan: #38BDF8;
    --accent-indigo: #6366F1;
    --accent-purple: #A855F7;
    --border-color: #374151;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

body.light-theme {
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-card: #F1F5F9;
    --bg-card-hover: #E2E8F0;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --border-color: #CBD5E1;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* NAVBAR */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
}

body.light-theme .navbar {
    background-color: rgba(255, 255, 255, 0.9);
}

.nav-container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
}

.brand-icon {
    font-size: 26px;
}

.brand-badge {
    font-size: 11px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    color: white;
    padding: 2px 8px;
    border-radius: 20px;
    text-transform: uppercase;
    font-weight: 800;
}

.nav-links {
    display: flex;
    gap: 28px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    font-size: 14.5px;
    transition: color 0.2s;
}

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

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

.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-primary);
    transition: background 0.2s;
}

.btn-icon:hover {
    background: var(--bg-card);
}

/* BUTTONS */
.btn-primary {
    background: linear-gradient(135deg, #00ADB5, #2563EB);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(0, 173, 181, 0.35);
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 173, 181, 0.5);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

/* HERO SECTION */
.hero-section {
    padding: 80px 0 60px;
    background: radial-gradient(circle at 50% 10%, rgba(0, 173, 181, 0.12) 0%, transparent 60%);
}

.hero-container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 173, 181, 0.15);
    border: 1px solid rgba(0, 173, 181, 0.3);
    color: var(--accent-cyan);
    padding: 6px 14px;
    border-radius: 30px;
    font-size: 12.5px;
    font-weight: 700;
    margin-bottom: 20px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-cyan);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-cyan);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(1.3); }
}

.hero-title {
    font-size: 50px;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.gradient-text {
    background: linear-gradient(135deg, #00ADB5, #38BDF8, #818CF8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 580px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 36px;
}

.hero-trust {
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* KEYBOARD MOCKUP */
.keyboard-mockup {
    background: #111827;
    border: 1.5px solid #374151;
    border-radius: var(--radius-lg);
    padding: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.mockup-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-bottom: 12px;
    border-bottom: 1px solid #1F2937;
    font-size: 11.5px;
    color: #9CA3AF;
}

.mockup-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.mockup-dot.red { background: #EF4444; }
.mockup-dot.yellow { background: #F59E0B; }
.mockup-dot.green { background: #10B981; }

.mockup-title {
    font-weight: 700;
    color: white;
}
.mockup-status {
    margin-left: auto;
    font-size: 10.5px;
    color: #38BDF8;
    background: #0C4A6E;
    padding: 2px 8px;
    border-radius: 10px;
}

.mockup-display {
    background: #030712;
    border: 1px solid #1F2937;
    border-radius: var(--radius-sm);
    padding: 14px;
    margin: 12px 0;
    font-size: 16px;
    font-weight: 700;
    color: #F3F4F6;
    display: flex;
    align-items: center;
    gap: 6px;
}

.display-cursor {
    width: 3px;
    height: 20px;
    background: #00ADB5;
    animation: blink 1s infinite;
}

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

.mockup-smart-replies {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 0.8fr;
    gap: 6px;
    margin-bottom: 8px;
}

.smart-tile {
    font-size: 10.5px;
    font-weight: 700;
    padding: 8px 6px;
    border-radius: 4px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.smart-tile.primary { background: #1A365D; color: #90CDF4; }
.smart-tile.success { background: #1C4532; color: #9AE6B4; }
.smart-tile.warning { background: #3B2447; color: #E9D8FD; }
.smart-tile.tone { background: #4A154B; color: #F6AD55; font-weight: 800; }

.mockup-prediction-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    margin-bottom: 12px;
}

.pred-tile {
    background: #1E293B;
    border: 1px solid #334155;
    color: #38BDF8;
    padding: 8px 4px;
    border-radius: 4px;
    text-align: center;
    font-size: 11px;
    font-weight: 700;
}

.mockup-keys {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
}

.key {
    background: #2D3748;
    color: white;
    padding: 10px 4px;
    border-radius: 4px;
    text-align: center;
    font-weight: 800;
    font-size: 12px;
    border: 1px solid #4A5568;
}

/* SECTION PADDING & TITLES */
.section-padding {
    padding: 80px 0;
}

.bg-alt {
    background-color: var(--bg-secondary);
}

.text-center { text-align: center; }
.text-left { text-align: left; }

.section-badge {
    color: var(--accent-blue);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    display: inline-block;
    margin-bottom: 8px;
}

.section-title {
    font-size: 34px;
    font-weight: 800;
    margin-bottom: 14px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 16.5px;
    max-width: 650px;
    margin: 0 auto 40px;
}

/* GRIDS */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.feature-card, .ai-box, .spec-card, .hardware-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: transform 0.2s, border-color 0.2s;
}

.feature-card:hover, .ai-box:hover, .spec-card:hover, .hardware-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
}

.card-icon, .ai-box-icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.feature-card h3, .ai-box h3, .spec-card h4, .hardware-card h3 {
    font-size: 19px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p, .ai-box p, .spec-card p, .hardware-card p {
    color: var(--text-secondary);
    font-size: 14.5px;
    line-height: 1.6;
}

/* PRICING */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.pricing-card.popular {
    border: 2px solid var(--accent-blue);
    background: linear-gradient(180deg, rgba(0, 173, 181, 0.08) 0%, var(--bg-card) 100%);
}

.popular-tag {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-blue);
    color: white;
    font-size: 10.5px;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 12px;
}

.pricing-card.charity {
    border: 2px solid #EC4899;
}

.plan-header h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 4px;
}

.plan-header p {
    font-size: 12.5px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.plan-price {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.plan-price span {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.plan-features {
    list-style: none;
    margin-bottom: 28px;
    flex-grow: 1;
}

.plan-features li {
    font-size: 13.5px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* DOWNLOAD BOX */
.download-box {
    background: linear-gradient(135deg, rgba(0, 173, 181, 0.15), rgba(37, 99, 235, 0.15));
    border: 1.5px solid var(--accent-blue);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    max-width: 800px;
    margin: 0 auto;
}

.download-box h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
}

.download-box p {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 28px;
}

.download-actions {
    margin-bottom: 20px;
}

.version-meta {
    font-size: 13px;
    color: var(--text-secondary);
}

/* CONTACT & FEEDBACK FORM */
.contact-form-container {
    max-width: 680px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13.5px;
    font-weight: 700;
    margin-bottom: 8px;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14.5px;
}

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

.form-status {
    margin-top: 14px;
    font-size: 14px;
    font-weight: 700;
    text-align: center;
}

/* FOOTER */
.footer {
    background: #060911;
    border-top: 1px solid var(--border-color);
    padding: 48px 0 24px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
}

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

.footer-copy {
    color: #6B7280;
    font-size: 12.5px;
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero-container { grid-template-columns: 1fr; }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .grid-2, .grid-3, .pricing-grid { grid-template-columns: 1fr; }
    .hero-title { font-size: 34px; }
}

/* MODAL STİLLERİ (ÖDEME & LİSANS) */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(3, 7, 18, 0.85);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-card {
    background: #111827;
    border: 1px solid #38BDF8;
    border-radius: 16px;
    width: 100%;
    max-width: 480px;
    padding: 28px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
    position: relative;
    animation: modalPop 0.25s ease-out;
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    border-bottom: 1px solid #1E293B;
    padding-bottom: 12px;
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: #94A3B8;
    font-size: 18px;
    cursor: pointer;
}

.modal-close-btn:hover {
    color: white;
}

.payment-plan-badge {
    background: #1E3A8A;
    color: #60A5FA;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
}

/* ÖDEME YÖNTEMLERİ SEÇİCİ (TABS) */
.gateway-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    border-bottom: 1px solid #1E293B;
    padding-bottom: 8px;
}

.gateway-tab {
    flex: 1;
    background: #1E293B;
    color: #94A3B8;
    border: 1px solid #334155;
    padding: 8px 6px;
    border-radius: 8px;
    font-size: 11.5px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
}

.gateway-tab:hover {
    background: #334155;
    color: white;
}

.gateway-tab.active {
    background: #00ADB5;
    color: #0B0F19;
    border-color: #00ADB5;
}