/* ============================================
   Tekin Fischer Solutions — APAI Website
   ============================================ */

:root {
    --color-bg: #0a0a0f;
    --color-bg-alt: #0f0f18;
    --color-surface: #151520;
    --color-surface-light: #1a1a2a;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-accent: #1F4E79;
    --color-accent-light: #2a6aa3;
    --color-accent-glow: rgba(31, 78, 121, 0.3);
    --color-text: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.6);
    --color-text-tertiary: rgba(255, 255, 255, 0.4);
    --color-success: #34d399;
    --color-danger: #f87171;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 12px;
    --radius-lg: 20px;
    --max-width: 1140px;
}

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

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

body {
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

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

/* ============================================
   Navigation
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 14px 0;
}

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

.nav-logo {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
}


.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    transition: color 0.2s ease;
}

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

.nav-cta {
    background: var(--color-accent);
    color: var(--color-text) !important;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500 !important;
    transition: background 0.2s ease, transform 0.2s ease !important;
}

.nav-cta:hover {
    background: var(--color-accent-light) !important;
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    padding: 16px 32px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-text);
    box-shadow: 0 0 30px var(--color-accent-glow);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: 0 0 40px var(--color-accent-glow), 0 8px 30px rgba(0,0,0,0.3);
}

.btn-large {
    font-size: 1.125rem;
    padding: 20px 40px;
    border-radius: 12px;
}

.btn-full {
    width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 100px 0 60px;
    position: relative;
    overflow: clip;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent-light);
    background: rgba(31, 78, 121, 0.15);
    border: 1px solid rgba(31, 78, 121, 0.3);
    padding: 8px 16px;
    border-radius: 100px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.75rem;
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-sub {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-width: 520px;
    margin-bottom: 32px;
}

.hero-sub-small {
    font-size: 0.95rem;
    color: var(--color-accent-light);
    margin-bottom: 16px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.hero-cta-group {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.hero-cta-note {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
}

/* Chat Mockup */
.chat-mockup {
    background: var(--color-surface);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 60px var(--color-accent-glow);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}

.chat-avatar {
    width: 36px;
    height: 36px;
    background: var(--color-accent);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

.chat-name {
    font-size: 0.875rem;
    font-weight: 600;
}

.chat-status {
    font-size: 0.75rem;
    color: var(--color-success);
}

.chat-messages {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.chat-msg {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.85rem;
    line-height: 1.6;
    max-width: 88%;
}

.chat-msg-user {
    background: var(--color-accent);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.chat-msg-ai {
    background: var(--color-surface-light);
    border: 1px solid var(--color-border);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-tertiary);
    opacity: 0.4;
    animation: scrollBounce 2.5s ease-in-out infinite;
    transition: opacity 0.5s ease;
}

.scroll-indicator.hidden {
    opacity: 0;
    pointer-events: none;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(6px); }
}

/* Typing Animation */
.chat-msg-typing {
    display: inline-flex;
    gap: 4px;
    padding: 12px 16px;
    background: var(--color-surface-light);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    border-bottom-left-radius: 4px;
    align-self: flex-start;
}

.chat-msg-typing span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-text-tertiary);
    animation: typingDot 1.4s ease-in-out infinite;
}

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

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

@keyframes typingDot {
    0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
    30% { opacity: 1; transform: translateY(-3px); }
}

.chat-msg-typing-user {
    align-self: flex-end;
    background: var(--color-accent);
    border: none;
}

/* ============================================
   Sections — General
   ============================================ */

.section {
    padding: 120px 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent-light);
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.section-sub {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.section-subtitle {
    font-size: 1.35rem;
    color: var(--color-text-secondary);
    font-weight: 400;
    margin-bottom: 16px;
}

.accent {
    color: var(--color-accent-light);
}

/* ============================================
   Problem Section
   ============================================ */

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

.problem-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.problem-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.problem-icon {
    width: 52px;
    height: 52px;
    background: rgba(31, 78, 121, 0.12);
    border: 1px solid rgba(31, 78, 121, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--color-accent-light);
}

.problem-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.problem-card p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* ============================================
   Solution Section — Before / After
   ============================================ */

.before-after {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: stretch;
    margin-bottom: 80px;
}

.ba-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
}

.ba-label {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.ba-before .ba-label {
    color: var(--color-danger);
}

.ba-after .ba-label {
    color: var(--color-success);
}

.ba-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.ba-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.ba-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    margin-top: 1px;
}

.ba-icon-bad {
    background: rgba(248, 113, 113, 0.12);
    color: var(--color-danger);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

.ba-icon-good {
    background: rgba(52, 211, 153, 0.12);
    color: var(--color-success);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.ba-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.ba-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-text-tertiary);
}

/* ============================================
   Solution Section — Features Grid
   ============================================ */

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

.feature {
    text-align: center;
    padding: 36px 24px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.feature:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.feature-more {
    border-color: rgba(31, 78, 121, 0.25);
}

.feature-cta {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-accent-light);
    transition: color 0.2s ease;
}

.feature-cta:hover {
    color: var(--color-text);
}

/* ============================================
   How It Works Section
   ============================================ */

.steps {
    max-width: 640px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 28px;
    align-items: flex-start;
}

.step-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-accent);
    line-height: 1;
    flex-shrink: 0;
    width: 64px;
    letter-spacing: -0.02em;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.step-content p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

.step-line {
    width: 2px;
    height: 48px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    margin-left: 31px;
    opacity: 0.4;
}

/* ============================================
   Pricing Section
   ============================================ */

.pricing-card {
    max-width: 580px;
    margin: 0 auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px;
}

.pricing-items {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 28px;
}

.pricing-item-label {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.pricing-item-desc {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.pricing-divider {
    height: 1px;
    background: var(--color-border);
}

.pricing-note {
    background: rgba(31, 78, 121, 0.08);
    border: 1px solid rgba(31, 78, 121, 0.15);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 28px;
}

.pricing-note p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.65;
}

/* ============================================
   Why TFS Section
   ============================================ */

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

.diff-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.diff-card:hover {
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.diff-icon {
    width: 48px;
    height: 48px;
    background: rgba(31, 78, 121, 0.12);
    border: 1px solid rgba(31, 78, 121, 0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    color: var(--color-accent-light);
}

.diff-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.diff-card p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   CTA Section
   ============================================ */

.section-cta {
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.section-cta::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 700px;
    height: 500px;
    background: radial-gradient(ellipse, var(--color-accent-glow) 0%, transparent 70%);
    pointer-events: none;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.cta-note {
    display: block;
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
}

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 48px;
}

.footer-logo {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: color 0.2s ease;
}

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

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-contact a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: color 0.2s ease;
}

.footer-contact a:hover {
    color: var(--color-text);
}

.footer-cta {
    color: var(--color-accent-light) !important;
    font-weight: 500;
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

/* ============================================
   Fade-in Animations
   ============================================ */

.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-delay {
    transition-delay: 0.2s;
}

/* Hero elements animate on load, not on scroll */
.hero .fade-in {
    animation: heroFadeIn 0.8s ease forwards;
}

.hero .fade-in.fade-in-delay {
    animation-delay: 0.25s;
}

@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .section-header h2 {
        font-size: 2.25rem;
    }

    .problems-grid,
    .features-grid,
    .diff-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 960px) {
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10, 10, 15, 1);
        z-index: 1000;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s ease, visibility 0.4s ease;
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-links a {
        font-size: 1.25rem;
        color: var(--color-text-secondary);
    }

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

    .nav-toggle {
        display: flex;
        z-index: 1001;
        position: relative;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 80px 0 40px;
        min-height: 100vh;
        min-height: 100dvh;
    }

    .hero .container {
        display: flex;
        flex-direction: column;
    }

    .hero-content {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        min-height: calc(100vh - 120px);
        min-height: calc(100dvh - 120px);
    }

    .hero-content + .hero-visual {
        min-height: auto;
    }

    .hero h1 {
        font-size: 3.2rem;
        margin-top: 16px;
    }

    .hero-sub {
        font-size: 1.1rem;
    }

    .hero-sub-small {
        font-size: 1.05rem;
    }

    .hero-visual {
        order: 2;
        margin-top: 24px;
    }

    .hero-cta-group {
        margin-top: auto;
        padding-top: 24px;
    }

    .hero-cta-group .btn {
        width: 100%;
    }

    .scroll-indicator {
        display: none;
    }

    .section {
        padding: 80px 0;
    }

    .section-header h2 {
        font-size: 1.85rem;
    }

    .section-header h2 br {
        display: none;
    }

    .problems-grid,
    .features-grid,
    .diff-grid {
        grid-template-columns: 1fr;
    }

    .before-after {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .ba-divider {
        transform: rotate(90deg);
    }

    .pricing-card {
        padding: 32px 24px;
    }

    .cta-content h2 {
        font-size: 2.25rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 24px;
    }

    .btn-large {
        width: 100%;
        padding: 18px 32px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 3rem;
    }

    .section-header h2 {
        font-size: 1.6rem;
    }

    .cta-content h2 {
        font-size: 1.85rem;
    }

    .step {
        flex-direction: column;
        gap: 12px;
    }

    .step-line {
        display: none;
    }

    .step {
        margin-bottom: 24px;
    }
}