/* ============================================
   Yazılım BİZ - Light & Dark Tema
   ============================================ */

/* Renkler & Değişkenler */
:root {
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-border: #e0e0e0;
    --color-primary: #0066cc;
    --color-primary-hover: #0052a3;
    --color-secondary: #f0f0f0;
    --color-accent: #0066cc;
    --color-success: #28a745;
    --color-warning: #ff9800;
    --color-danger: #dc3545;
    --color-info: #17a2b8;

    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

    --transition: all 0.2s ease;
}

html[data-theme="dark"] {
    --color-bg: #1a1a1a;
    --color-bg-secondary: #2d2d2d;
    --color-text: #ffffff;
    --color-text-light: #b0b0b0;
    --color-border: #404040;
    --color-primary: #4a90e2;
    --color-primary-hover: #357abd;
    --color-secondary: #333333;
    --color-accent: #4a90e2;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    font-size: 14px;
    transition: var(--transition);
}

/* Tipografi */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.95rem; }

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

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

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Grid */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Flexbox */
.flex {
    display: flex;
    gap: var(--spacing-md);
}

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

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-col { flex-direction: column; }

/* ============================================
   HEADER & NAV
   ============================================ */

header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    gap: var(--spacing-lg);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
    white-space: nowrap;
}

.logo img {
    height: 32px;
    width: auto;
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

nav a {
    color: var(--color-text);
    font-size: 0.95rem;
    padding: 0.5rem 0;
    position: relative;
    font-weight: 500;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
}

nav a:hover::after {
    width: 100%;
}

nav a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition);
    border-radius: 1px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    nav {
        position: fixed;
        top: 50px;
        right: -100%;
        width: 100%;
        height: calc(100vh - 50px);
        background: var(--color-bg);
        border-top: 1px solid var(--color-border);
        transition: var(--transition);
        z-index: 999;
    }

    nav.active {
        right: 0;
    }

    nav ul {
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
    }

    nav a {
        font-size: 1rem;
    }

    nav a::after {
        display: none;
    }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

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

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

.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

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

.btn-outline {
    border: 2px solid var(--color-primary);
    background: transparent;
    color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 0.8rem 1.6rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-content h1 {
    font-size: 2.2rem;
    margin-bottom: var(--spacing-md);
}

.hero-content p {
    font-size: 1.05rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-lg);
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: var(--spacing-lg);
    transition: var(--transition);
}

.card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    background: var(--color-secondary);
}

.card-footer {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

/* ============================================
   FORMS
   ============================================ */

form {
    max-width: 600px;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
textarea,
select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: var(--transition);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

.form-error {
    color: var(--color-danger);
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
}

/* ============================================
   SECTIONS
   ============================================ */

section {
    padding: var(--spacing-xl) var(--spacing-lg);
}

section > .container {
    max-width: 1200px;
    margin: 0 auto;
}

section h2 {
    margin-bottom: var(--spacing-lg);
}

.section-subtitle {
    color: var(--color-text-light);
    font-size: 1rem;
    margin-bottom: var(--spacing-xl);
}

section:nth-child(even) {
    background-color: var(--color-bg-secondary);
}

/* ============================================
   PRICING
   ============================================ */

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.pricing-card {
    padding: var(--spacing-lg);
    border: 2px solid var(--color-border);
    border-radius: 6px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
    transform: scale(1.02);
}

.pricing-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.plan-name {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.plan-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.plan-price-type {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.plan-features {
    list-style: none;
    margin: var(--spacing-lg) 0;
    text-align: left;
}

.plan-features li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.plan-features li:before {
    content: "✓ ";
    color: var(--color-success);
    font-weight: bold;
    margin-right: var(--spacing-sm);
}

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

/* ============================================
   IMAGES & GALLERY
   ============================================ */

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.gallery-image {
    position: relative;
    overflow: hidden;
    border-radius: 6px;
    aspect-ratio: 16 / 10;
    border: 1px solid var(--color-border);
}

.gallery-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-image:hover img {
    transform: scale(1.05);
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 6px;
    margin: var(--spacing-lg) 0;
    background: var(--color-secondary);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    color: var(--color-primary);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 4px;
    background: var(--color-border);
    color: var(--color-text);
    transition: var(--transition);
    font-size: 0.9rem;
}

.social-links a:hover {
    background: var(--color-primary);
    color: white;
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* ============================================
   UTILITIES
   ============================================ */

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

.text-muted { color: var(--color-text-light); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-inline-block { display: inline-block; }
.d-flex { display: flex; }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.rounded { border-radius: 6px; }
.rounded-lg { border-radius: 12px; }

.shadow { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1); }
.shadow-lg { box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15); }

.badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    border-radius: 3px;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--color-secondary);
    color: var(--color-text);
}

.badge-primary { background: var(--color-primary); color: white; }
.badge-success { background: var(--color-success); color: white; }
.badge-warning { background: var(--color-warning); color: white; }
.badge-danger { background: var(--color-danger); color: white; }

.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-xl) 0;
}

/* ============================================
   ALERTS
   ============================================ */

.alert {
    padding: var(--spacing-md);
    border-radius: 4px;
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
}

.alert-success {
    background: rgba(40, 167, 69, 0.1);
    border: 1px solid var(--color-success);
    color: var(--color-success);
}

.alert-warning {
    background: rgba(255, 152, 0, 0.1);
    border: 1px solid var(--color-warning);
    color: var(--color-warning);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--color-danger);
    color: var(--color-danger);
}

.alert-info {
    background: rgba(23, 162, 184, 0.1);
    border: 1px solid var(--color-info);
    color: var(--color-info);
}

/* ============================================
   THEME TOGGLE
   ============================================ */

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    color: var(--color-text);
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--color-primary);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.35rem; }
}

@media (max-width: 768px) {
    section {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.1rem; }

    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    nav ul {
        gap: var(--spacing-md);
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .card {
        padding: var(--spacing-md);
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: scale(1);
    }

    .image-gallery {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* ============================================
   PRINT
   ============================================ */

@media print {
    header, footer, .theme-toggle {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}