/* Check Tools - Main Stylesheet - Optimized for All Devices */

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

:root {
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #10b981;
  --error: #ef4444;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

/* ========== CONTAINER & LAYOUT ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem) clamp(0.75rem, 2vw, 1rem);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ========== HEADER ========== */
.header {
  text-align: center;
  margin-bottom: clamp(1.5rem, 4vw, 3rem);
  padding: 0 0.5rem;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.5rem, 2vw, 1rem);
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.logo-icon {
  font-size: clamp(2rem, 6vw, 3rem);
}

.header h1 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
  word-break: break-word;
}

.subtitle {
  color: var(--text-secondary);
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  margin-top: 0.5rem;
  padding: 0 0.5rem;
}

/* ========== MAIN CONTENT ========== */
main {
  flex: 1;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: clamp(1rem, 3vw, 1.5rem);
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(1.5rem, 3vw, 2rem);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  min-height: 250px;
  touch-action: manipulation;
}

.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow);
  border-color: var(--accent);
}

@media (hover: none) {
  .card:active {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
  }
}

.card-icon {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: clamp(0.75rem, 2vw, 1rem);
}

.card-title {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-desc {
  color: var(--text-secondary);
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  flex-grow: 1;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.card-footer {
  margin-top: auto;
}

.card-link {
  color: var(--accent);
  font-weight: 500;
  font-size: clamp(0.85rem, 2vw, 0.95rem);
}

/* ========== TOOL PAGES ========== */
.back-btn {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
  padding: clamp(0.5rem, 1.5vw, 0.75rem) clamp(1rem, 2vw, 1.25rem);
  border-radius: 0.5rem;
  transition: all 0.2s;
  font-size: clamp(0.9rem, 2vw, 1rem);
  touch-action: manipulation;
  min-height: 44px;
}

.back-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

.tool-header {
  text-align: center;
  margin-bottom: clamp(1.5rem, 4vw, 2rem);
  padding: 0 0.5rem;
}

.tool-icon {
  font-size: clamp(3rem, 8vw, 4rem);
  margin-bottom: clamp(0.75rem, 2vw, 1rem);
}

.tool-header h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: 0.5rem;
  line-height: 1.2;
  word-break: break-word;
}

.tool-header p {
  color: var(--text-secondary);
  font-size: clamp(0.9rem, 2.5vw, 1rem);
  line-height: 1.4;
}

/* ========== TOOL BOX ========== */
.tool-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(1rem, 3vw, 2rem);
  margin-bottom: clamp(1rem, 3vw, 2rem);
}

.input-group {
  display: flex;
  gap: clamp(0.5rem, 2vw, 1rem);
  flex-wrap: wrap;
}

.input-field {
  flex: 1;
  min-width: min(250px, 100%);
  padding: clamp(0.75rem, 2vw, 1rem) clamp(1rem, 2.5vw, 1.25rem);
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  color: var(--text-primary);
  font-size: clamp(0.9rem, 2vw, 1rem);
  transition: all 0.2s;
  touch-action: manipulation;
  min-height: 44px;
}

.input-field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.btn-primary {
  padding: clamp(0.75rem, 2vw, 1rem) clamp(1.5rem, 3vw, 2rem);
  background: var(--accent);
  color: white;
  border: none;
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  font-size: clamp(0.9rem, 2vw, 1rem);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  touch-action: manipulation;
  min-height: 44px;
  min-width: 44px;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ========== RESULT BOX ========== */
.result-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(1rem, 3vw, 2rem);
  margin-bottom: clamp(1rem, 3vw, 2rem);
  animation: fadeIn 0.3s ease;
}

.result-header {
  display: flex;
  align-items: flex-start;
  gap: clamp(1rem, 2.5vw, 1.5rem);
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.result-icon {
  font-size: clamp(2rem, 5vw, 3rem);
  flex-shrink: 0;
}

.result-icon.success {
  color: var(--success);
}

.result-icon.error {
  color: var(--error);
}

.result-title {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  margin-bottom: 0.25rem;
  line-height: 1.2;
}

.result-title.success {
  color: var(--success);
}

.result-title.error {
  color: var(--error);
}

.result-url {
  color: var(--text-secondary);
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  word-break: break-all;
  overflow-wrap: break-word;
  line-height: 1.4;
}

.result-details {
  background: var(--bg-dark);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  padding: clamp(1rem, 2.5vw, 1.5rem);
}

.detail-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: clamp(0.5rem, 1.5vw, 0.75rem) 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.detail-item:last-child {
  border-bottom: none;
}

.detail-label {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: clamp(0.8rem, 2vw, 0.9rem);
}

.detail-value {
  color: var(--text-primary);
  font-weight: 600;
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  text-align: right;
  word-break: break-word;
}

/* ========== IP RESULT ========== */
.ip-result-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(1rem, 3vw, 2rem);
  animation: fadeIn 0.3s ease;
}

.ip-display {
  text-align: center;
  padding: clamp(1rem, 3vw, 2rem);
  background: var(--bg-dark);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  margin-bottom: clamp(1rem, 3vw, 2rem);
}

.ip-label {
  color: var(--text-secondary);
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  margin-bottom: clamp(0.5rem, 1.5vw, 0.75rem);
}

.ip-value {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--accent);
  margin-bottom: clamp(0.75rem, 2vw, 1rem);
  font-family: 'Courier New', monospace;
  word-break: break-all;
  overflow-wrap: break-word;
  line-height: 1.2;
}

.btn-copy {
  padding: clamp(0.5rem, 1.5vw, 0.75rem) clamp(1rem, 2.5vw, 1.5rem);
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: clamp(0.375rem, 1.25vw, 0.5rem);
  cursor: pointer;
  transition: all 0.2s;
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  touch-action: manipulation;
  min-height: 44px;
  min-width: 44px;
}

.btn-copy:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

/* ========== INFO GRID ========== */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(180px, 100%), 1fr));
  gap: clamp(0.75rem, 2vw, 1rem);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(0.75rem, 2vw, 1rem);
  background: var(--bg-dark);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
}

.info-icon {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  flex-shrink: 0;
}

.info-label {
  color: var(--text-secondary);
  font-size: clamp(0.75rem, 2vw, 0.85rem);
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.info-value {
  color: var(--text-primary);
  font-weight: 600;
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  word-break: break-word;
  line-height: 1.3;
}

/* ========== DOMAIN RESULT ========== */
.domain-result-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(1rem, 3vw, 2rem);
  animation: fadeIn 0.3s ease;
}

.domain-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(1rem, 2.5vw, 1.5rem);
  padding: clamp(1rem, 2.5vw, 1.5rem);
  background: var(--bg-dark);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  margin-bottom: clamp(1rem, 3vw, 2rem);
}

.domain-icon {
  font-size: clamp(2rem, 5vw, 3rem);
}

.domain-name {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  line-height: 1.2;
  word-break: break-all;
}

.domain-ip {
  font-size: clamp(1rem, 2.5vw, 1.1rem);
  color: var(--accent);
  font-family: 'Courier New', monospace;
  word-break: break-all;
  line-height: 1.2;
}

.location-info {
  margin-bottom: clamp(1rem, 3vw, 2rem);
}

.section-title {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 600;
  margin-bottom: clamp(0.75rem, 2vw, 1rem);
  color: var(--text-primary);
  line-height: 1.2;
}

.additional-info {
  background: var(--bg-dark);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  padding: clamp(1rem, 2.5vw, 1.5rem);
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: clamp(0.5rem, 1.5vw, 0.75rem) 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.info-row:last-child {
  border-bottom: none;
}

.info-row .info-label,
.info-row .info-value {
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  line-height: 1.3;
}

/* ========== HISTORY ========== */
.history-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(1rem, 2.5vw, 1.5rem);
  animation: fadeIn 0.3s ease;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: clamp(0.75rem, 2vw, 1rem);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.history-header h3 {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 600;
  line-height: 1.2;
}

.btn-clear {
  padding: clamp(0.5rem, 1.5vw, 0.75rem) clamp(1rem, 2vw, 1.25rem);
  background: transparent;
  color: var(--error);
  border: 1px solid var(--error);
  border-radius: clamp(0.375rem, 1.25vw, 0.5rem);
  cursor: pointer;
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  transition: all 0.2s;
  touch-action: manipulation;
  min-height: 44px;
  min-width: 44px;
}

.btn-clear:hover {
  background: var(--error);
  color: white;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: clamp(0.5rem, 1.5vw, 0.75rem);
}

.history-item {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1rem);
  padding: clamp(0.75rem, 2vw, 1rem);
  background: var(--bg-dark);
  border-radius: clamp(0.5rem, 1.5vw, 0.75rem);
  cursor: pointer;
  transition: all 0.2s;
  touch-action: manipulation;
}

.history-item:hover {
  background: var(--bg-card-hover);
  transform: translateX(4px);
}

.history-icon {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  flex-shrink: 0;
}

.history-content {
  flex: 1;
  min-width: 0;
}

.history-url {
  color: var(--text-primary);
  font-weight: 500;
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  line-height: 1.3;
}

.history-time {
  color: var(--text-muted);
  font-size: clamp(0.75rem, 2vw, 0.85rem);
  line-height: 1.3;
}

.history-meta {
  color: var(--text-secondary);
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  flex-shrink: 0;
  line-height: 1.3;
}

/* ========== LOADING ========== */
.loading-box {
  text-align: center;
  padding: clamp(2rem, 5vw, 3rem);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: clamp(0.75rem, 2vw, 1rem);
}

.spinner {
  width: clamp(36px, 8vw, 48px);
  height: clamp(36px, 8vw, 48px);
  border: clamp(3px, 0.8vw, 4px) solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto clamp(0.75rem, 2vw, 1rem);
}

.loading-box p {
  color: var(--text-secondary);
  font-size: clamp(0.9rem, 2.5vw, 1rem);
}

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

/* ========== ERROR BOX ========== */
.error-box {
  text-align: center;
  padding: clamp(1.5rem, 4vw, 2rem);
  background: var(--bg-card);
  border: 1px solid var(--error);
  border-radius: clamp(0.75rem, 2vw, 1rem);
}

.error-icon {
  font-size: clamp(3rem, 8vw, 4rem);
  margin-bottom: clamp(0.75rem, 2vw, 1rem);
}

.error-box h3 {
  color: var(--error);
  margin-bottom: 0.5rem;
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  line-height: 1.2;
}

.error-box p {
  color: var(--text-secondary);
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
  font-size: clamp(0.9rem, 2.5vw, 1rem);
  line-height: 1.4;
}

.error-box .btn-primary {
  min-width: 120px;
}

/* ========== FOOTER ========== */
.footer {
  text-align: center;
  padding: clamp(1rem, 3vw, 2rem) 0;
  color: var(--text-muted);
  font-size: clamp(0.8rem, 2vw, 0.9rem);
  margin-top: auto;
}

.footer-note {
  margin-top: 0.5rem;
  font-size: clamp(0.75rem, 2vw, 0.85rem);
}

/* ========== UTILITIES ========== */
.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== RESPONSIVE ADJUSTMENTS ========== */
@media (max-width: 768px) {
  .header h1 {
    font-size: clamp(1.25rem, 4vw, 1.75rem);
  }

  .card {
    min-height: 220px;
  }

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

  .input-field {
    width: 100%;
    font-size: 16px; /* Ngăn zoom trên iOS */
  }

  .btn-primary {
    width: 100%;
    font-size: 16px; /* Ngăn zoom trên iOS */
  }

  .info-grid {
    grid-template-columns: repeat(auto-fit, minmax(min(150px, 100%), 1fr));
  }

  .history-header {
    flex-direction: column;
    align-items: stretch;
  }

  .history-header h3 {
    text-align: center;
  }

  .btn-clear {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .card {
    min-height: auto;
  }

  .result-header {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .detail-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .detail-value {
    text-align: left;
    width: 100%;
  }

  .info-item {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.5rem;
  }

  .history-item {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }

  .history-content {
    width: 100%;
    text-align: center;
  }

  .history-url {
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
  }

  .history-meta {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0.75rem 0.5rem;
  }

  .tool-box,
  .result-box,
  .domain-result-box,
  .ip-result-box,
  .history-section {
    padding: 1rem;
  }

  .card {
    padding: 1.25rem;
  }

  .card-title {
    font-size: 1.1rem;
  }

  .tool-header h1 {
    font-size: 1.3rem;
  }

  .ip-value {
    font-size: 1.3rem;
  }

  .section-title {
    font-size: 1.1rem;
  }
}

@media (max-width: 359px) {
  .container {
    padding: 0.5rem;
  }

  .card {
    padding: 1rem;
  }

  .card-title {
    font-size: 1rem;
  }

  .tool-header h1 {
    font-size: 1.2rem;
  }

  .ip-value {
    font-size: 1.2rem;
  }

  .btn-primary,
  .btn-copy,
  .btn-clear {
    padding: 0.75rem 1rem;
  }
}

/* ========== SAFARI/iOS SPECIFIC FIXES ========== */
@supports (-webkit-touch-callout: none) {
  .input-field,
  .btn-primary,
  .btn-copy,
  .btn-clear {
    font-size: 16px; /* Prevent zoom on focus in iOS Safari */
  }
  
  .card {
    -webkit-tap-highlight-color: transparent;
  }
}

/* ========== DARK MODE SUPPORT ========== */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
  }
}

/* ========== PRINT STYLES ========== */
@media print {
  .back-btn,
  .btn-primary,
  .btn-copy,
  .btn-clear,
  .card:hover,
  .history-item:hover {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .container {
    max-width: 100%;
    padding: 0;
  }
  
  .card,
  .tool-box,
  .result-box,
  .ip-result-box,
  .domain-result-box {
    border: 1px solid #ddd;
    box-shadow: none;
    break-inside: avoid;
  }
}