/* ==========================================================================
   Sirkeci Software – Design System
   -apple-system, BlinkMacSystemFont, "SF Pro", "Segoe UI", Roboto, sans-serif
   ========================================================================== */

:root {
    --color-primary: #34C759;
    --color-primary-hover: #2db84e;
    --color-primary-active: #28a745;
    --color-bg: #F2F2F7;
    --color-bg-elevated: #FFFFFF;
    --color-text: #1C1C1E;
    --color-text-secondary: #8E8E93;
    --color-card-bg: rgba(52, 199, 89, 0.08);
    --color-card-border: rgba(52, 199, 89, 0.12);
    --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.08);
    --radius-card: 20px;
    --radius-btn: 9999px;
    --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro", "Segoe UI", Roboto, sans-serif;
    --header-height: 64px;
    --space-unit: 8px;
    --space-xs: calc(var(--space-unit) * 1);
    --space-sm: calc(var(--space-unit) * 2);
    --space-md: calc(var(--space-unit) * 3);
    --space-lg: calc(var(--space-unit) * 5);
    --space-xl: calc(var(--space-unit) * 8);
    --space-2xl: calc(var(--space-unit) * 12);
    --space-3xl: calc(var(--space-unit) * 16);
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --color-bg: #1C1C1E;
    --color-bg-elevated: #2C2C2E;
    --color-text: #F2F2F7;
    --color-text-secondary: #8E8E93;
    --color-card-bg: rgba(52, 199, 89, 0.12);
    --color-card-border: rgba(52, 199, 89, 0.2);
    --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* Base
   ========================================================================== */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
    opacity: 0.9;
}

/* Layout
   ========================================================================== */

.container {
    width: 100%;
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-md);
    padding-right: var(--space-md);
}

.main-content {
    min-height: calc(100vh - var(--header-height));
    padding-bottom: var(--space-3xl);
}

/* Header
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-height);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-card-border);
    transition: background var(--transition-smooth), border-color var(--transition-smooth);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.logo {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-text) !important;
}

.logo:hover {
    opacity: 0.85;
}

.nav-main {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-main a {
    color: var(--color-text-secondary);
    font-weight: 500;
}

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

.lang-switcher {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    font-size: 0.9375rem;
}

.lang-sep {
    color: var(--color-text-secondary);
    padding: 0 4px;
    font-weight: 300;
}

.lang-link {
    color: var(--color-text-secondary);
    padding: 4px 8px;
    border-radius: 6px;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.lang-link:hover {
    color: var(--color-text);
}

.lang-link.is-active {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-link.is-active:hover {
    opacity: 1;
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    border-radius: var(--radius-btn);
    background: transparent;
    cursor: pointer;
    color: var(--color-text-secondary);
    font-size: 1.25rem;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-card-bg);
    color: var(--color-text);
}

.theme-icon.moon { display: none; }
.theme-icon.sun { display: inline; }
[data-theme="dark"] .theme-icon.moon { display: inline; }
[data-theme="dark"] .theme-icon.sun { display: none; }

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-btn);
    cursor: pointer;
    transition: transform var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 6px 20px rgba(52, 199, 89, 0.35);
}

.btn-secondary {
    background-color: var(--color-bg-elevated);
    color: var(--color-text);
    border: 2px solid var(--color-card-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* Cards
   ========================================================================== */

.card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: var(--radius-card);
    padding: 20px;
    box-shadow: var(--shadow-soft);
    transition: box-shadow var(--transition-smooth), transform var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-card);
}

/* ==========================================================================
   Home Page
   ========================================================================== */

.page-home .hero {
    padding: var(--space-3xl) var(--space-md) var(--space-2xl);
    text-align: center;
}

.hero-inner {
    max-width: 720px;
    margin: 0 auto;
}

.hero-title {
    margin: 0 0 var(--space-md);
    font-size: clamp(2.25rem, 6vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.hero-subtitle {
    margin: 0 0 var(--space-lg);
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* Apps section */

.apps-section {
    padding: var(--space-2xl) 0;
}

.section-title {
    margin: 0 0 var(--space-lg);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
}

.apps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    max-width: 480px;
    margin: 0 auto;
}

.app-card .app-card-inner {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.app-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.app-card-title {
    margin: 0 0 var(--space-xs);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.app-card-desc {
    margin: 0 0 var(--space-md);
    font-size: 1rem;
    color: var(--color-text-secondary);
    flex-grow: 1;
}

/* ==========================================================================
   NoFume Page
   ========================================================================== */

.page-nofume .site-footer {
    border-top: 1px solid var(--color-card-border);
}

.nofume-hero {
    padding: var(--space-2xl) var(--space-md) var(--space-3xl);
    text-align: center;
}

.nofume-hero-title {
    margin: 0 0 var(--space-sm);
    font-size: clamp(3rem, 12vw, 4.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.nofume-hero-subtitle {
    margin: 0 0 var(--space-lg);
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    color: var(--color-text-secondary);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* Sections */

.section {
    padding: var(--space-2xl) 0;
}

.section-lead {
    margin: 0 0 var(--space-lg);
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* Problem */

.problem-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.problem-card h3 {
    margin: 0 0 var(--space-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.problem-card p {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

@media (min-width: 640px) {
    .problem-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* Features */

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.feature-card {
    text-align: center;
}

.feature-icon {
    display: block;
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.feature-card h3 {
    margin: 0 0 var(--space-xs);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
}

.feature-card p {
    margin: 0;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

@media (min-width: 640px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Timeline */

.timeline {
    margin-top: var(--space-lg);
    position: relative;
}

.timeline-item {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    position: relative;
}

.timeline-item:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 36px;
    bottom: -var(--space-md);
    width: 2px;
    background: var(--color-card-border);
    border-radius: 2px;
}

.timeline-marker {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-primary);
    margin-top: 4px;
    box-shadow: 0 0 0 4px var(--color-card-bg);
}

.timeline-content {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
}

.timeline-content strong {
    color: var(--color-primary);
}

/* Premium / Pricing */

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-md);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.pricing-card {
    position: relative;
    text-align: center;
}

.pricing-card.pricing-popular {
    border-color: var(--color-primary);
    box-shadow: 0 8px 32px rgba(52, 199, 89, 0.15);
}

.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-btn);
}

.pricing-card h3 {
    margin: 0 0 var(--space-xs);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.pricing-desc {
    margin: 0 0 var(--space-md);
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

.pricing-features {
    margin: 0 0 var(--space-md);
    padding: 0;
    list-style: none;
    text-align: left;
    max-width: 240px;
    margin-left: auto;
    margin-right: auto;
}

.pricing-features li {
    padding: var(--space-xs) 0;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-card-border);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-price {
    margin: 0 0 var(--space-md);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

@media (min-width: 560px) {
    .pricing-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* CTA Section */

.cta-section {
    padding: var(--space-3xl) 0;
    text-align: center;
    background: var(--color-card-bg);
    border-radius: var(--radius-card);
    margin: 0 var(--space-md) var(--space-2xl);
}

.cta-title {
    margin: 0 0 var(--space-lg);
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--color-text);
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* NoFume footer */

.nofume-footer {
    padding: var(--space-lg) var(--space-md);
    text-align: center;
    border-top: 1px solid var(--color-card-border);
}

.nofume-footer p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.nofume-footer strong {
    color: var(--color-text);
}

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

.site-footer {
    padding: var(--space-lg) var(--space-md);
    background: var(--color-bg-elevated);
    transition: background var(--transition-smooth);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    margin: 0 0 var(--space-xs);
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--color-text);
}

.footer-copy {
    margin: 0;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

/* Accessibility & focus
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
    outline: none;
}