/* ===================================
   E-DANIŞAN WEB SİTESİ - MAIN CSS
   =================================== */

/* CSS Variables */
:root {
    /* Primary Colors (Logo Mavi) */
    --primary-900: #001f3f;
    --primary-800: #002d5a;
    --primary-700: #003d7a;
    --primary-600: #004d95;
    --primary-500: #0060b5;

    /* Secondary (Açık Mavi) */
    --secondary-500: #3b82f6;
    --secondary-400: #60a5fa;
    --secondary-300: #93c5fd;

    /* Neutral */
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;

    /* Background */
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #003d7a;

    /* Success & Alert */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;

    /* Font Families */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Font Sizes */
    --text-xs: 0.75rem;
    /* 12px */
    --text-sm: 0.875rem;
    /* 14px */
    --text-base: 1rem;
    /* 16px */
    --text-lg: 1.125rem;
    /* 18px */
    --text-xl: 1.25rem;
    /* 20px */
    --text-2xl: 1.5rem;
    /* 24px */
    --text-3xl: 2rem;
    /* 32px */
    --text-4xl: 2.5rem;
    /* 40px */
    --text-5xl: 3.5rem;
    /* 56px */

    /* Spacing */
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 1.5rem;
    /* 24px */
    --spacing-lg: 2rem;
    /* 32px */
    --spacing-xl: 3rem;
    /* 48px */
    --spacing-2xl: 4rem;
    /* 64px */
    --spacing-3xl: 6rem;
    /* 96px */

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Border Radius */
    --radius-sm: 0.25rem;
    /* 4px */
    --radius-base: 0.5rem;
    /* 8px */
    --radius-lg: 0.75rem;
    /* 12px */
    --radius-xl: 1rem;
    /* 16px */
    --radius-full: 9999px;

    /* Container Max Width */
    --container-max: 1200px;
}

/* ===================================
   CSS Reset & Base Styles
   =================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--text-5xl);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-3xl);
}

h4 {
    font-size: var(--text-2xl);
}

h5 {
    font-size: var(--text-xl);
}

h6 {
    font-size: var(--text-lg);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-700);
}

a {
    color: var(--primary-700);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--primary-600);
}

/* ===================================
   Layout & Container
   =================================== */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-3xl) 0;
}

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

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

/* ===================================
   Header & Navigation
   =================================== */

.header {
    position: sticky;
    top: 0;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.nav-logo img {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--gray-700);
    font-weight: 500;
    font-size: var(--text-base);
    transition: color var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-700);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--gray-800);
    margin: 5px 0;
    transition: transform var(--transition-base);
}

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

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-base);
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-700);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-600);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 61, 122, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-700);
    border: 2px solid var(--primary-700);
}

.btn-secondary:hover {
    background-color: var(--primary-700);
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--text-lg);
}

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

.card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-base);
    transition: all var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.card-icon {
    width: 64px;
    height: 64px;
    background-color: var(--secondary-300);
    border-radius: var(--radius-base);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.card-icon i {
    font-size: var(--text-3xl);
    color: var(--primary-700);
}

.card-title {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.card-description {
    color: var(--gray-600);
    line-height: 1.6;
}

/* ===================================
   Form Styles
   =================================== */

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

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--gray-700);
}

.form-label .required {
    color: var(--error);
    margin-left: 4px;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-body);
    font-size: var(--text-base);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-base);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(0, 61, 122, 0.1);
}

.form-control::placeholder {
    color: var(--gray-400);
}

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

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-error {
    color: var(--error);
    font-size: var(--text-sm);
    margin-top: var(--spacing-xs);
    display: none;
}

.form-error.active {
    display: block;
}

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

.footer {
    background-color: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section:first-child {
    margin-right: auto;
}

.footer-section h5 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-logo {
    margin-bottom: var(--spacing-md);
}

.footer-logo img {
    height: 40px;
    width: auto;
    filter: brightness(0) invert(1);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--gray-400);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: white;
}

.footer-section p {
    color: white;
}

.footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: var(--spacing-md);
    text-align: center;
    color: var(--gray-300);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.footer-logo-sm {
    height: 18px;
    width: auto;
    filter: brightness(0) invert(0.7);
    transition: filter var(--transition-base);
    margin-left: 0.5rem;
    margin-right: 0;
}

.footer-logo-sm:hover {
    filter: brightness(0) invert(1);
}

/* ===================================
   Utility Classes
   =================================== */

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

.text-primary {
    color: var(--primary-700);
}

.mb-0 {
    margin-bottom: 0;
}

.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);
}

.mt-0 {
    margin-top: 0;
}

.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);
}

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

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

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

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

.flex {
    display: flex;
}

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

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

.gap-sm {
    gap: var(--spacing-sm);
}

.gap-md {
    gap: var(--spacing-md);
}

.gap-lg {
    gap: var(--spacing-lg);
}

.hidden {
    display: none;
}