/**
 * app.css - Ana Uygulama Stilleri
 * 
 * Layout, bileşenler ve responsive tasarım
 */

/* ===== BASE STYLES ===== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #070721 0%, #141043 35%, #3b1470 70%, #2a0f4a 100%);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ===== BACKGROUND ===== */

.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: 
    radial-gradient(1200px 700px at 75% 10%, rgba(155, 55, 255, 0.55), transparent 60%),
    radial-gradient(900px 600px at 40% 5%, rgba(90, 55, 255, 0.25), transparent 60%),
    radial-gradient(1000px 800px at 55% 75%, rgba(120, 40, 210, 0.35), transparent 65%),
    linear-gradient(135deg, #070721 0%, #141043 35%, #3b1470 70%, #2a0f4a 100%);
  filter: saturate(1.08);
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: linear-gradient(135deg, rgba(7, 7, 33, 0.95) 0%, rgba(20, 16, 67, 0.95) 100%);
  border-bottom: 1px solid rgba(236, 72, 153, 0.2);
  backdrop-filter: blur(10px);
  padding: 0;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-2xl);
  gap: var(--spacing-2xl);
}

.logo {
  font-size: var(--font-2xl);
  font-weight: var(--font-extrabold);
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
}

.logo h1 {
  margin: 0;
  font-size: inherit;
  color: inherit;
}

.nav {
  display: flex;
  gap: var(--spacing-2xl);
  flex: 1;
  margin-left: var(--spacing-2xl);
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: var(--font-medium);
  transition: all var(--transition-base);
}

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

.header-actions {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
  margin-left: auto;
  white-space: nowrap;
}

.btn-icon {
  background: none;
  border: none;
  font-size: var(--font-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  transition: all var(--transition-base);
  position: relative;
}

.btn-icon:hover {
  transform: scale(1.1);
}

.language-selector {
  position: relative;
}

.lang-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-top: var(--spacing-sm);
  z-index: var(--z-dropdown);
  min-width: 150px;
  box-shadow: var(--shadow-lg);
}

.lang-menu button {
  display: block;
  width: 100%;
  padding: var(--spacing-md);
  background: none;
  border: none;
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  font-size: var(--font-sm);
}

.lang-menu button:hover {
  background: var(--color-border-light);
  color: var(--color-primary);
}

/* Main Content */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
  min-height: calc(100vh - 200px);
}

/* Footer */
.footer {
  background: linear-gradient(135deg, rgba(7, 7, 33, 0.9) 0%, rgba(20, 16, 67, 0.9) 100%);
  border-top: 1px solid rgba(236, 72, 153, 0.2);
  padding: var(--spacing-2xl);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-2xl);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--transition-base);
}

.footer-links a:hover {
  color: var(--color-primary);
}

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

.btn-primary,
.btn-secondary {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--font-sm);
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(236, 72, 153, 0.2);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background: rgba(236, 72, 153, 0.3);
}

/* ===== MODAL ===== */

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: slideUp var(--transition-base);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-lg);
}

.modal-header h2 {
  margin: 0;
  color: var(--color-text);
  font-size: var(--font-xl);
}

.close-btn {
  background: none;
  border: none;
  font-size: var(--font-2xl);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.close-btn:hover {
  background: var(--color-border-light);
  color: var(--color-text);
}

/* ===== SPINNER ===== */

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(236, 72, 153, 0.2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 2rem auto;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== TOOLS GRID ===== */

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.tool-card {
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

.tool-card:hover {
  background: rgba(20, 16, 67, 0.8);
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(236, 72, 153, 0.2);
}

.tool-card-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: var(--spacing-md);
}

.tool-card-icon {
  font-size: var(--font-3xl);
}

.tool-card-title {
  font-size: var(--font-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.tool-card-desc {
  color: var(--color-text-muted);
  font-size: var(--font-sm);
  line-height: 1.5;
}

.tool-card-category {
  display: inline-block;
  background: rgba(236, 72, 153, 0.2);
  color: var(--color-primary);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-xs);
  margin-top: var(--spacing-md);
}

/* ===== SEARCH BOX ===== */

.search-box {
  margin: var(--spacing-2xl) 0;
}

.search-box input {
  width: 100%;
  max-width: 600px;
  padding: var(--spacing-lg);
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--font-base);
  transition: all var(--transition-base);
}

.search-box input::placeholder {
  color: var(--color-text-muted);
}

.search-box input:focus {
  background: rgba(20, 16, 67, 0.8);
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.1);
}

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

.hero {
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.hero h1 {
  font-size: var(--font-4xl);
  font-weight: var(--font-extrabold);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--font-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

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

@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: var(--spacing-lg);
  }

  .nav {
    width: 100%;
    justify-content: center;
  }

  .header-actions {
    width: 100%;
    justify-content: center;
  }

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

  .hero h1 {
    font-size: var(--font-2xl);
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }

  .modal-content {
    width: 95%;
    padding: var(--spacing-lg);
  }
}


/* ===== ADMIN PANEL ===== */

.admin-panel {
  max-width: 1200px;
  margin: 0 auto;
}

.admin-panel h1 {
  font-size: var(--font-3xl);
  color: var(--color-text);
  margin-bottom: var(--spacing-2xl);
}

.admin-tabs {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}

.admin-tab-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-weight: var(--font-medium);
  border-bottom: 2px solid transparent;
  transition: all var(--transition-base);
}

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

.admin-tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.admin-tab-content {
  background: rgba(20, 16, 67, 0.4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.admin-tab-content h2 {
  font-size: var(--font-2xl);
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

.admin-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.admin-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.admin-item:hover {
  background: rgba(20, 16, 67, 0.8);
  border-color: var(--color-primary);
}

.admin-item > div:first-child {
  flex: 1;
}

.admin-item strong {
  display: block;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
}

.admin-item p {
  color: var(--color-text-muted);
  font-size: var(--font-sm);
  margin: 0;
}

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

.btn-small {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-sm);
}


/* ===== UNIT CONVERSION PAGE ===== */

.unit-conversion-page {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-2xl) 0;
}

.conversion-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.conversion-header h1 {
  font-size: var(--font-3xl);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.conversion-header p {
  color: var(--color-text-muted);
  font-size: var(--font-lg);
}

.conversion-container {
  background: rgba(20, 16, 67, 0.4);
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-3xl);
  backdrop-filter: blur(10px);
}

.category-selector {
  margin-bottom: var(--spacing-3xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.category-selector label {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-lg);
}

.category-selector select {
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.3);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--font-md);
  cursor: pointer;
  transition: all var(--transition-base);
}

.category-selector select:hover,
.category-selector select:focus {
  border-color: var(--color-primary);
  background: rgba(20, 16, 67, 0.8);
  outline: none;
}

.conversion-box {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  margin-bottom: var(--spacing-3xl);
}

.conversion-side {
  display: flex;
  flex-direction: column;
}

.conversion-field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.conversion-field label {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-md);
}

.input-group {
  display: flex;
  gap: var(--spacing-md);
}

.conversion-input {
  flex: 1;
  padding: var(--spacing-lg);
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.3);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--font-lg);
  font-weight: 500;
  transition: all var(--transition-base);
}

.conversion-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(20, 16, 67, 0.8);
  box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.1);
}

.conversion-input.result {
  background: rgba(20, 16, 67, 0.4);
  cursor: default;
}

.conversion-select {
  padding: var(--spacing-lg);
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.3);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  font-size: var(--font-md);
  cursor: pointer;
  transition: all var(--transition-base);
  min-width: 120px;
}

.conversion-select:hover,
.conversion-select:focus {
  border-color: var(--color-primary);
  background: rgba(20, 16, 67, 0.8);
  outline: none;
}

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

.swap-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.2), rgba(155, 55, 255, 0.2));
  border: 2px solid rgba(236, 72, 153, 0.4);
  color: var(--color-primary);
  font-size: var(--font-2xl);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.swap-btn:hover {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.3), rgba(155, 55, 255, 0.3));
  border-color: var(--color-primary);
  transform: rotate(180deg);
}

.conversion-history {
  background: rgba(20, 16, 67, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
}

.conversion-history h3 {
  font-size: var(--font-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
  font-weight: 600;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.history-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(20, 16, 67, 0.4);
  border-radius: var(--radius-md);
  font-size: var(--font-sm);
  color: var(--color-text-muted);
}

.history-from {
  font-weight: 500;
  color: var(--color-text);
  flex: 1;
}

.history-arrow {
  color: var(--color-primary);
  font-weight: bold;
}

.history-to {
  font-weight: 500;
  color: var(--color-text);
  flex: 1;
}

.history-time {
  font-size: var(--font-xs);
  color: var(--color-text-muted);
  margin-left: auto;
}

.empty-state {
  text-align: center;
  padding: var(--spacing-3xl);
  color: var(--color-text-muted);
  font-size: var(--font-lg);
}

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

@media (max-width: 768px) {
  .conversion-box {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

  .conversion-swap {
    order: -1;
    margin-bottom: var(--spacing-lg);
  }

  .input-group {
    flex-direction: column;
  }

  .conversion-select {
    min-width: 100%;
  }

  .conversion-container {
    padding: var(--spacing-2xl);
  }

  .history-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .history-time {
    margin-left: 0;
  }
}


/* ===== MODAL STYLES ===== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

/* FIX: modal görünürlüğü (app.css içindeki iki modal tanımı çakışıyor) */
.modal {
  opacity: 1 !important;
  pointer-events: all !important;
}

.modal.hidden {
  display: none !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.modal-content {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  border-radius: 16px;
  padding: 2rem;
  width: 90%;
  max-width: 420px;
  position: relative;
  border: 1px solid rgba(236, 72, 153, 0.3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #EC4899;
  transition: color 0.2s ease;
  padding: 0.5rem;
}

.modal-close:hover {
  color: #ff69b4;
}

/* ===== AUTH TABS ===== */

.auth-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 2rem;
  border-bottom: 2px solid rgba(236, 72, 153, 0.2);
}

.auth-tab-btn {
  flex: 1;
  padding: 1rem;
  background: none;
  border: none;
  color: #999;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  position: relative;
}

.auth-tab-btn:hover {
  color: #EC4899;
}

.auth-tab-btn.active {
  color: #EC4899;
  border-bottom-color: #EC4899;
}

/* ===== AUTH TAB CONTENT ===== */

.auth-tab-content {
  display: none;
  animation: fadeIn 0.3s ease-out;
}

.auth-tab-content.active {
  display: block !important;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ===== FORM STYLES ===== */

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem;
  background: rgba(15, 15, 30, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: 8px;
  color: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #EC4899;
  background: rgba(15, 15, 30, 0.8);
  box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: #666;
}

.form-group small {
  display: block;
  margin-top: 0.5rem;
  color: #999;
  font-size: 0.85rem;
}

/* ===== MESSAGE OPTIONS ===== */

.message-options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.message-option {
  padding: 1rem;
  background: rgba(15, 15, 30, 0.6);
  border: 1px solid rgba(236, 72, 153, 0.2);
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

.message-option:hover {
  border-color: #EC4899;
  color: #EC4899;
  background: rgba(236, 72, 153, 0.1);
}

.message-option.active {
  background: linear-gradient(135deg, #EC4899 0%, #d946a6 100%);
  color: #fff;
  border-color: #EC4899;
}

/* ===== ALERT STYLES ===== */

.alert {
  padding: 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
  margin-top: 1rem;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ff6b6b;
}

.alert-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #4ade80;
}

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

@media (max-width: 640px) {
  .modal-content {
    width: 95%;
    padding: 1.5rem;
  }

  .auth-tabs {
    margin-bottom: 1.5rem;
  }

  .auth-tab-btn {
    padding: 0.75rem;
    font-size: 0.9rem;
  }

  .form-group {
    margin-bottom: 1.25rem;
  }

  .form-group label {
    font-size: 0.9rem;
  }

  .form-group input,
  .form-group textarea {
    padding: 0.75rem;
    font-size: 0.9rem;
  }
}