/* ============================================
   ALAETIKET DESIGN SYSTEM
   Referans: Aesop, COS, Apple
   Felsefe: Sessiz, Güçlü, Matematiksel
   ============================================ */

/* 
   TASARIM PRENSİPLERİ:
   - Görsel olmadan güçlü layout
   - Matematiksel oranlar (Golden Ratio: 1.618)
   - Bilinçli boşluklar
   - Cesur ama sessiz tipografi
   - WCAG AA+ kontrast
*/

:root {
  /* ============================================
     RENK SİSTEMİ - Minimal & Güçlü
     ============================================ */
  
  /* Ana Renk - Koyu, Ciddi, Profesyonel */
  --color-primary: #1A1A1A;
  --color-primary-soft: #2D2D2D;
  
  /* Vurgu - Sessiz Bronz (Sadece kritik noktalar) */
  --color-accent: #9B8B6F;
  --color-accent-dark: #7A6F5D;
  
  /* Nötr Palet */
  --color-text: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  
  /* Zemin - Sıcak Beyaz */
  --color-bg: #FEFEFE;
  --color-bg-secondary: #F8F8F7;
  --color-bg-tertiary: #F0F0EF;
  
  /* Çizgiler - Minimal */
  --color-border: #E8E8E7;
  --color-border-light: #F0F0EF;
  
  /* ============================================
     TİPOGRAFİ - Cesur ama Sessiz
     ============================================ */
  
  /* Font Stack - System fonts, hızlı, temiz */
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-secondary: "Times New Roman", Georgia, serif;
  
  /* Font Weights - Sadece 2 ağırlık */
  --weight-normal: 400;
  --weight-medium: 500;
  
  /* Font Sizes - Matematiksel ölçek (1.25 ratio) */
  --text-xs: 0.64rem;      /* 10.24px */
  --text-sm: 0.8rem;       /* 12.8px */
  --text-base: 1rem;       /* 16px */
  --text-md: 1.25rem;      /* 20px */
  --text-lg: 1.563rem;     /* 25px */
  --text-xl: 1.953rem;     /* 31.25px */
  --text-2xl: 2.441rem;    /* 39px */
  --text-3xl: 3.052rem;    /* 48.8px */
  --text-4xl: 3.815rem;    /* 61px */
  --text-5xl: 4.768rem;    /* 76.3px */
  
  /* Line Heights - Ritmik */
  --leading-tight: 1.2;
  --leading-base: 1.5;
  --leading-loose: 1.8;
  
  /* Letter Spacing - Minimal */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  
  /* ============================================
     BOŞLUK SİSTEMİ - Golden Ratio (1.618)
     ============================================ */
  
  --space-1: 0.25rem;      /* 4px */
  --space-2: 0.5rem;       /* 8px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.618rem;     /* 26px - Golden */
  --space-6: 2rem;         /* 32px */
  --space-8: 2.618rem;     /* 42px - Golden */
  --space-10: 4rem;        /* 64px */
  --space-12: 4.236rem;    /* 68px - Golden */
  --space-16: 6.854rem;    /* 110px - Golden */
  --space-20: 8rem;        /* 128px */
  --space-24: 11.09rem;    /* 177px - Golden */
  
  /* Section Spacing - Matematiksel */
  --section-xs: 4rem;      /* 64px */
  --section-sm: 6.854rem;  /* 110px */
  --section-md: 11.09rem;  /* 177px */
  --section-lg: 17.944rem; /* 287px */
  
  /* ============================================
     LAYOUT - Grid Sistemi
     ============================================ */
  
  --container-max: 1440px;
  --container-reading: 720px;
  --container-narrow: 640px;
  
  --grid-gap: var(--space-8);
  --grid-columns: 12;
  
  /* ============================================
     BORDER & RADIUS - Minimal
     ============================================ */
  
  --radius-none: 0;
  --radius-sm: 2px;
  --radius-md: 4px;
  
  /* ============================================
     SHADOWS - Subtle
     ============================================ */
  
  --shadow-subtle: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-soft: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.08);
  
  /* ============================================
     TRANSITIONS - Smooth
     ============================================ */
  
  --ease-standard: cubic-bezier(0.4, 0.0, 0.2, 1);
  --ease-decelerate: cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-accelerate: cubic-bezier(0.4, 0.0, 1, 1);
  
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
}

/* ============================================
   RESET - Minimal & Clean
   ============================================ */

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  line-height: var(--leading-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ============================================
   TIPOGRAFI COMPONENTS
   ============================================ */

/* Display - Cesur, büyük, az kullanılan */
.display {
  font-size: var(--text-5xl);
  font-weight: var(--weight-normal);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

/* Heading 1 - Sayfa başlığı */
.h1 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-normal);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

/* Heading 2 - Section başlığı */
.h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-normal);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-text);
}

/* Heading 3 - Alt başlık */
.h3 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-normal);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

/* Heading 4 */
.h4 {
  font-size: var(--text-xl);
  font-weight: var(--weight-medium);
  line-height: var(--leading-base);
  color: var(--color-text);
}

/* Body Large */
.body-lg {
  font-size: var(--text-lg);
  line-height: var(--leading-loose);
  color: var(--color-text-secondary);
}

/* Body Base */
.body {
  font-size: var(--text-base);
  line-height: var(--leading-base);
  color: var(--color-text-secondary);
}

/* Body Small */
.body-sm {
  font-size: var(--text-sm);
  line-height: var(--leading-base);
  color: var(--color-text-tertiary);
}

/* Caption */
.caption {
  font-size: var(--text-xs);
  line-height: var(--leading-base);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */

/* Container - Matematiksel padding */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}

.container-reading {
  max-width: var(--container-reading);
}

.container-narrow {
  max-width: var(--container-narrow);
}

/* Section - Ritmik spacing */
.section {
  padding-top: var(--section-md);
  padding-bottom: var(--section-md);
}

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

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

/* Grid - 12 column system */
.grid {
  display: grid;
  gap: var(--grid-gap);
}

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

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ============================================
   BUTTON COMPONENT - Tek versiyon
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-bg);
  background-color: var(--color-text);
  border: 1px solid var(--color-text);
  border-radius: var(--radius-none);
  cursor: pointer;
  transition: all var(--duration-base) var(--ease-standard);
}

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

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

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

.btn-link {
  padding: 0;
  color: var(--color-text);
  background: none;
  border: none;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.btn-link:hover {
  color: var(--color-accent-dark);
}

/* ============================================
   FORM COMPONENTS - Minimal & Clean
   ============================================ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  transition: border-color var(--duration-base) var(--ease-standard);
}

.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: var(--color-text);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-text-tertiary);
}

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

/* ============================================
   CARD COMPONENT - Minimal
   ============================================ */

.card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  transition: border-color var(--duration-base) var(--ease-standard);
}

.card:hover {
  border-color: var(--color-text);
}

.card-content {
  padding: var(--space-8);
}

/* ============================================
   DIVIDER - Subtle
   ============================================ */

.divider {
  height: 1px;
  background-color: var(--color-border);
  border: none;
}

.divider-vertical {
  width: 1px;
  height: 100%;
  background-color: var(--color-border);
}

/* ============================================
   LINK - Understated
   ============================================ */

.link {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: color var(--duration-base) var(--ease-standard);
}

.link:hover {
  color: var(--color-accent-dark);
}

/* ============================================
   RESPONSIVE - Mobile First
   ============================================ */

@media (max-width: 1024px) {
  :root {
    --section-md: 8rem;
    --section-lg: 12rem;
  }
  
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
  
  .display { font-size: var(--text-4xl); }
  .h1 { font-size: var(--text-3xl); }
  .h2 { font-size: var(--text-2xl); }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --section-md: 6rem;
    --section-lg: 8rem;
  }
  
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }
  
  .display { font-size: var(--text-3xl); }
  .h1 { font-size: var(--text-2xl); }
  .h2 { font-size: var(--text-xl); }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

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

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

.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;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Spacing */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

/* Text alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Colors */
.text-primary { color: var(--color-text); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-accent { color: var(--color-accent); }

.bg-primary { background-color: var(--color-bg); }
.bg-secondary { background-color: var(--color-bg-secondary); }
.bg-tertiary { background-color: var(--color-bg-tertiary); }