/* ============================================================
   KURUMSAL ELEKTRİK WEB SİTESİ - ANA TEMA
   Beyaz/Mavi/Yeşil Kurumsal Tasarım
   ============================================================ */

/* ============================================================
   1. DESIGN TOKENS (CSS Variables)
   ============================================================ */

:root {
  /* Renkler - Primary */
  --color-primary: #0066CC;
  --color-primary-dark: #004C99;
  --color-primary-light: #3385D6;
  --color-primary-contrast: #FFFFFF;
  
  /* Renkler - Secondary */
  --color-secondary: #00A651;
  --color-secondary-dark: #008041;
  --color-secondary-light: #4CAF50;
  
  /* Renkler - Neutral */
  --color-bg: #FFFFFF;
  --color-surface: #F7F8FA;
  --color-surface-dark: #E5E7EB;
  --color-text: #1A1A1A;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  
  /* Renkler - Durum */
  --color-success: #00A651;
  --color-error: #DC2626;
  --color-warning: #F59E0B;
  --color-info: #0066CC;
  
  /* Tipografi */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  
  /* 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: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  
  /* Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-none: none;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Container */
  --container-max: 1280px;
  --container-padding: 1.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

/* ============================================================
   2. RESET & BASE STYLES
   ============================================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

.content-wrapper {
  min-height: 50vh;
  position: relative;
}

/* ============================================================
   3. TYPOGRAPHY
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--text-4xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--text-2xl);
}

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

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

h6 {
  font-size: var(--text-base);
  font-weight: 600;
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

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

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

strong, b {
  font-weight: 600;
}

/* Responsive Typography */
@media (min-width: 768px) {
  h1 {
    font-size: var(--text-5xl);
  }
  
  h2 {
    font-size: var(--text-4xl);
  }
  
  h3 {
    font-size: var(--text-3xl);
  }
  
  p {
    font-size: var(--text-lg);
  }
}

/* ============================================================
   4. LAYOUT UTILITIES
   ============================================================ */

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

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

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

.section--compact {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
  }
  
  .section--compact {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

/* Stack (vertical spacing) */
.stack > * + * {
  margin-top: var(--space-4);
}

.stack--sm > * + * {
  margin-top: var(--space-2);
}

.stack--lg > * + * {
  margin-top: var(--space-8);
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--space-6);
}

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

.grid--3 {
  grid-template-columns: repeat(1, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(1, 1fr);
}

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

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

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

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

/* ============================================================
   5. BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  white-space: nowrap;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-primary-contrast);
  transform: translateY(-1px);
}

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

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

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

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

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: transparent;
}

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

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

/* ============================================================
   6. CARDS (Minimal)
   ============================================================ */

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

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

.card--flat {
  border: none;
  box-shadow: none;
}

.card--flat:hover {
  box-shadow: none;
}

/* ============================================================
   7. SECTION HEADINGS
   ============================================================ */

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-12);
}

.section-header__label {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.section-header__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.section-header__description {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .section-header__title {
    font-size: var(--text-4xl);
  }
}

/* ============================================================
   8. FORMS
   ============================================================ */

.form-group {
  margin-bottom: var(--space-6);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

.form-error {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-error);
  margin-top: var(--space-2);
}

/* ============================================================
   9. BADGES & LABELS
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge--primary {
  background-color: rgba(0, 102, 204, 0.1);
  color: var(--color-primary);
}

.badge--secondary {
  background-color: rgba(0, 166, 81, 0.1);
  color: var(--color-secondary);
}

.badge--gray {
  background-color: var(--color-surface);
  color: var(--color-text-muted);
}

/* ============================================================
   10. ICONS & SVG
   ============================================================ */

.icon {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  vertical-align: middle;
  fill: currentColor;
}

.icon--sm {
  width: 1em;
  height: 1em;
}

.icon--lg {
  width: 1.5em;
  height: 1.5em;
}

.icon--xl {
  width: 2em;
  height: 2em;
}

/* ============================================================
   11. UTILITIES
   ============================================================ */

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

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

.text-muted {
  color: var(--color-text-muted);
}

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

.text-secondary {
  color: var(--color-secondary);
}

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

.border-top {
  border-top: 1px solid var(--color-border);
}

.border-bottom {
  border-bottom: 1px solid var(--color-border);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================================
   12. RESPONSIVE UTILITIES
   ============================================================ */

.mobile-only {
  display: block;
}

.desktop-only {
  display: none;
}

@media (min-width: 1024px) {
  .mobile-only {
    display: none;
  }
  
  .desktop-only {
    display: block;
  }
}