/**
 * ==============================================================================
 * AG CLOUD TRANSIT — DESIGN SYSTEM & THEME TOKENS
 * Vibe: Royal Swiss Tournament & Classical Heritage (chesspoliwako design reference)
 * Light Mode First Default • Premium Nocturne Dark Mode • Responsive • Accessible
 * ==============================================================================
 */

:root {
  /* --- PALET LATAR BELAKANG (WARM PARCHMENT / LIGHT FIRST) --- */
  --bg-page: #f5f1e8;
  --bg-surface: #ffffff;
  --bg-soft: #faf8f3;
  --bg-sunken: #efeadd;
  --bg-glass: rgba(255, 255, 255, 0.78);
  --bg-glass-card: rgba(255, 255, 255, 0.92);

  /* Fallback aliases for backward compatibility & test suites */
  --bg-app: #f8fafc;
  --bg-card: var(--bg-surface);
  --bg-card-subtle: var(--bg-soft);
  --bg-hover: #e8e3d5;

  /* --- PALET ROYAL NAVY --- */
  --navy: #14213d;
  --navy-soft: #1f3157;
  --navy-deep: #0c1630;

  /* --- PALET ROYAL GOLD (BRAND ACCENT) --- */
  --gold: #b8891a;
  --gold-bright: #e0a82e;
  --gold-light: #f6e7b4;
  --gold-gradient: linear-gradient(135deg, #f1c24b 0%, #d29a1f 55%, #a87510 100%);
  --gold-glow: rgba(210, 154, 31, 0.28);
  --gold-border: rgba(184, 137, 26, 0.45);

  /* --- STATUS & ACCENT TOKENS --- */
  --green: #4d7c3a;
  --green-bright: #6a9a4f;
  --green-soft: rgba(77, 124, 58, 0.12);
  --green-border: rgba(77, 124, 58, 0.4);

  --rose: #c2410c;
  --rose-soft: rgba(194, 65, 12, 0.1);
  --rose-border: rgba(194, 65, 12, 0.35);

  --sky: #1d6fa5;
  --sky-bright: #7dd3fc;
  --sky-soft: rgba(29, 111, 165, 0.1);
  --sky-border: rgba(29, 111, 165, 0.35);

  /* Aliases for UI controls */
  --primary: #14213d;
  --primary-hover: #1f3157;
  --primary-text: #ffffff;
  --primary-subtle: rgba(20, 33, 61, 0.08);

  --danger: var(--rose);
  --danger-hover: #9a3412;
  --danger-subtle: var(--rose-soft);
  --danger-text: #ffffff;

  --warning-bg: #fffbeb;
  --warning-border: var(--gold-border);
  --warning-text: #92400e;

  --success-bg: #f0fdf4;
  --success-border: var(--green-border);
  --success-text: #166534;

  /* --- TEKS & TIPOGRAFI --- */
  --text-main: #14213d;
  --text-secondary: #4a5670;
  --text-muted: #8590a6;
  --text-subtle: #9ba7be;
  --text-inverse: #ffffff;

  /* --- BORDER & ELEVASI --- */
  --border-subtle: rgba(20, 33, 61, 0.09);
  --border-light: rgba(20, 33, 61, 0.16);
  --border-card: rgba(20, 33, 61, 0.1);
  --border-color: var(--border-subtle);
  --border-focus: var(--gold-bright);

  --shadow-sm: 0 1px 2px rgba(20, 33, 61, 0.06), 0 2px 8px rgba(20, 33, 61, 0.04);
  --shadow-md: 0 6px 22px -6px rgba(20, 33, 61, 0.16);
  --shadow-lg: 0 18px 44px -14px rgba(20, 33, 61, 0.28);
  --shadow-gold: 0 6px 20px -4px rgba(210, 154, 31, 0.35);

  /* --- FONT STACK --- */
  --font-heading: "Cinzel", "Georgia", serif;
  --font-body: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  --font-family: var(--font-body);

  /* --- SKALA UKURAN FONT --- */
  --fs-h1: clamp(1.4rem, 1.1rem + 1.2vw, 1.9rem);
  --fs-h2: clamp(1.05rem, 0.95rem + 0.5vw, 1.25rem);
  --fs-body: 0.9rem;
  --fs-small: 0.8rem;
  --fs-xs: 0.72rem;

  /* --- SUDUT RADIUS --- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-modal: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* ==============================================================================
 * DARK MODE ADAPTATION (PREMIUM CHESS NOCTURNE)
 * ============================================================================== */
body.dark, [data-theme="dark"] {
  --bg-page: #0a0f1d;
  --bg-surface: #10172a;
  --bg-soft: #172036;
  --bg-sunken: #070a14;
  --bg-glass: rgba(16, 23, 42, 0.85);
  --bg-glass-card: rgba(23, 32, 54, 0.85);

  --bg-app: #0a0f1d;
  --bg-card: var(--bg-surface);
  --bg-card-subtle: var(--bg-soft);
  --bg-hover: #1e293b;

  --navy: #f8fafc;
  --navy-soft: #cbd5e1;
  --navy-deep: #050811;

  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.15);
  --border-card: rgba(255, 255, 255, 0.1);
  --border-color: var(--border-subtle);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 48px -10px rgba(0, 0, 0, 0.7);

  --warning-bg: #291e0a;
  --warning-border: #85530d;
  --warning-text: #fde68a;

  --success-bg: #092c15;
  --success-border: #166534;
  --success-text: #86efac;

  --primary: #f8fafc;
  --primary-hover: #e2e8f0;
  --primary-text: #0c1630;
  --primary-subtle: rgba(255, 255, 255, 0.1);
}

/* ==============================================================================
 * RESET & BASE STYLES
 * ============================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  max-width: 100vw;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Ambient Chess Background Pattern */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(224, 168, 46, 0.14) 0%, transparent 55%),
    radial-gradient(circle at 100% 30%, rgba(77, 124, 58, 0.08) 0%, transparent 45%),
    repeating-conic-gradient(rgba(20, 33, 61, 0.025) 0 25%, transparent 0 50%);
  background-size: 100% 100%, 100% 100%, 64px 64px;
  pointer-events: none;
  z-index: 0;
}

body.dark::before, [data-theme="dark"] body::before {
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(224, 168, 46, 0.08) 0%, transparent 55%),
    radial-gradient(circle at 100% 30%, rgba(29, 111, 165, 0.08) 0%, transparent 45%),
    repeating-conic-gradient(rgba(255, 255, 255, 0.015) 0 25%, transparent 0 50%);
}

.chess-wrapper {
  position: relative;
  z-index: 1;
  width: min(94%, 1280px);
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3.5rem;
  box-sizing: border-box;
}

/* ==============================================================================
 * TOP NAVIGATION BAR (Royal Navy & Gold Accent)
 * ============================================================================== */
.app-header.top-nav-bar {
  display: block;
  margin-bottom: 1.75rem;
  border-radius: 18px;
  background: linear-gradient(135deg, #1f3157 0%, #14213d 55%, #0c1630 100%);
  border: 1px solid rgba(224, 168, 46, 0.55);
  box-shadow: var(--shadow-lg), 0 0 28px rgba(224, 168, 46, 0.12);
  position: relative;
  overflow: hidden;
  padding: 0;
}

.app-header.top-nav-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-conic-gradient(rgba(255, 255, 255, 0.035) 0 25%, transparent 0 50%) 0 0 / 40px 40px;
  -webkit-mask-image: linear-gradient(270deg, #000 0%, transparent 65%);
  mask-image: linear-gradient(270deg, #000 0%, transparent 65%);
  pointer-events: none;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
  padding: 1.1rem 1.5rem;
  position: relative;
  z-index: 1;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.brand-crest {
  width: 44px;
  height: 44px;
  background: var(--gold-gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #2a1c00;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  box-shadow: 0 4px 14px var(--gold-glow);
  flex-shrink: 0;
  letter-spacing: -0.5px;
}

.brand-title-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.brand-logo-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-title-text {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #ffffff;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-subtitle {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.02em;
  line-height: 1.35;
}

.header-actions-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* User Identity Session Badge */
.db-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(77, 124, 58, 0.28);
  border: 1px solid rgba(163, 230, 53, 0.45);
  color: #a3e635;
  font-size: 0.76rem;
  font-weight: 700;
  font-family: var(--font-mono);
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #4ade80;
  box-shadow: 0 0 8px #4ade80;
  animation: pulseDot 2s infinite ease-in-out;
  flex-shrink: 0;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.35); opacity: 0.6; }
}

/* Glass Buttons for Navigation Bar */
.btn-nav-glass {
  background: rgba(255, 255, 255, 0.09);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.22);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.5rem 0.95rem;
  border-radius: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-nav-glass:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(224, 168, 46, 0.7);
  transform: translateY(-1px);
  color: #ffffff;
}

/* Gold Action Button */
.btn-gold-action {
  background: var(--gold-gradient);
  color: #2a1c00;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.86rem;
  padding: 0.6rem 1.35rem;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 6px 18px var(--gold-glow);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-gold-action:hover:not(:disabled) {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 10px 24px rgba(210, 154, 31, 0.45);
}

.btn-gold-action:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* ==============================================================================
 * BENTO METRICS QUARTET
 * ============================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 0.95rem;
  transition: all 0.25s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--gold-border);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.stat-icon.gold {
  background: rgba(224, 168, 46, 0.15);
  color: var(--gold);
  border: 1px solid rgba(224, 168, 46, 0.4);
}

.stat-icon.green {
  background: var(--green-soft);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.stat-icon.sky {
  background: var(--sky-soft);
  color: var(--sky);
  border: 1px solid var(--sky-border);
}

.stat-icon.navy {
  background: rgba(20, 33, 61, 0.08);
  color: var(--navy);
  border: 1px solid var(--border-light);
}

body.dark .stat-icon.navy {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.02em;
}

.stat-label {
  font-size: 0.74rem;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 500;
}

/* ==============================================================================
 * MAIN CONTENT LAYOUT
 * ============================================================================== */
.main-content {
  flex: 1;
}

.content-container {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Alert Notification Banner */
.alert-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
  font-size: 0.88rem;
  animation: slideDown 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.alert-container.alert-error {
  background-color: var(--rose-soft);
  border-color: var(--rose-border);
  color: var(--rose);
}

.alert-container.alert-success {
  background-color: var(--green-soft);
  border-color: var(--green-border);
  color: var(--green);
}

.alert-content {
  display: flex;
  align-items: center;
  gap: 10px;
}

.alert-close {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: inherit;
  opacity: 0.7;
  padding: 0 4px;
}

.alert-close:hover {
  opacity: 1;
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==============================================================================
 * SECTION CARD PANELS (Swiss Card Panel)
 * ============================================================================== */
.section-card-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-md);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.section-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  padding-bottom: 0.95rem;
  border-bottom: 1px solid var(--border-subtle);
}

.section-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.section-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green-bright);
  box-shadow: 0 0 0 4px var(--green-soft);
  display: inline-block;
  flex-shrink: 0;
}

.section-dot.gold {
  background: var(--gold-bright);
  box-shadow: 0 0 0 4px var(--gold-glow);
}

.section-title-text {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.04em;
}

.card-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 3px;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
}

.badge-info {
  background: var(--gold-glow);
  color: var(--gold);
  border: 1px solid var(--gold-border);
}

/* ==============================================================================
 * DROPZONE UPLOAD AREA
 * ============================================================================== */
.dropzone {
  border: 2px dashed var(--gold-border);
  border-radius: var(--radius-md);
  padding: 2.75rem 1.5rem;
  text-align: center;
  background-color: var(--bg-soft);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--gold-bright);
  background-color: var(--bg-sunken);
  box-shadow: 0 0 20px var(--gold-glow);
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.dropzone-icon {
  font-size: 2.6rem;
  margin-bottom: 0.5rem;
}

.dropzone-text {
  font-size: 0.98rem;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.dropzone-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Staged Upload Details */
.upload-stage {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.file-preview-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 1.25rem;
  background-color: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.file-info-col {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.staged-name {
  font-weight: 700;
  font-size: 0.94rem;
  font-family: var(--font-body);
  color: var(--navy);
  word-break: break-all;
}

.staged-size {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* Progress Bar */
.progress-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.progress-label-row, .progress-byte-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.progress-track {
  width: 100%;
  height: 9px;
  background-color: var(--bg-sunken);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green-bright) 0%, var(--gold-bright) 100%);
  border-radius: var(--radius-full);
  transition: width 0.2s ease;
}

.upload-action-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 0.5rem;
}

/* ==============================================================================
 * MODERN SWISS TABLE (FILES LIST)
 * ============================================================================== */
.modern-swiss-wrapper {
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  width: 100%;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.modern-swiss-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.modern-swiss-table th {
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-soft);
  font-weight: 800;
  text-align: center;
}

.modern-swiss-table th.left {
  text-align: left;
}

.modern-swiss-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  text-align: center;
  font-family: var(--font-mono);
  font-weight: 600;
  vertical-align: middle;
}

.modern-swiss-table td.left,
.modern-swiss-table td.file-name-cell {
  text-align: left;
  font-family: var(--font-body);
}

.modern-swiss-table tbody tr:hover td {
  background: var(--bg-soft);
}

.file-name-cell {
  font-weight: 700;
  color: var(--navy);
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-expiry-badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background-color: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 0.74rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold);
}

.action-btn-group {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

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

/* Skeleton Loading */
.skeleton-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.skeleton-row {
  height: 54px;
  background: linear-gradient(90deg, var(--bg-soft) 25%, var(--bg-sunken) 50%, var(--bg-soft) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3.5rem 1.5rem;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 0.75rem;
}

.empty-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.4rem;
}

.empty-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  max-width: 380px;
  margin: 0 auto;
}

/* Pagination Row */
.pagination-row {
  margin-top: 1.25rem;
  text-align: center;
}

/* ==============================================================================
 * BUTTONS & FORM CONTROLS
 * ============================================================================== */
.btn {
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--navy-soft) 0%, var(--navy) 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 12px rgba(20, 33, 61, 0.18);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%);
  transform: translateY(-1px);
}

body.dark .btn-primary {
  background: var(--gold-gradient);
  color: #2a1c00;
  font-weight: 700;
}

.btn-secondary {
  background-color: var(--bg-soft);
  border: 1px solid var(--border-light);
  color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-sunken);
  border-color: var(--gold-border);
}

.btn-danger {
  background-color: var(--rose);
  color: #ffffff;
  border: 1px solid rgba(194, 65, 12, 0.5);
  box-shadow: 0 4px 12px var(--rose-soft);
}

.btn-danger:hover:not(:disabled) {
  background-color: #9a3412;
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-soft);
  color: var(--text-main);
  border-color: var(--border-subtle);
}

.btn-sm {
  padding: 0.38rem 0.75rem;
  font-size: 0.76rem;
  border-radius: var(--radius-sm);
}

/* ==============================================================================
 * MODALS (Royal Swiss Glass Backdrop)
 * ============================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(12, 22, 48, 0.72);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-card {
  background-color: var(--bg-surface);
  border: 1.5px solid var(--gold-border);
  border-radius: var(--radius-modal);
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow-lg), 0 0 32px var(--gold-glow);
  overflow: hidden;
  animation: popIn 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes popIn {
  0% { transform: scale(0.94); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-soft);
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.modal-title.delete-title {
  color: var(--rose);
}

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.key-input-field {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  background: var(--bg-soft);
  color: var(--text-main);
  transition: all 0.2s ease;
}

.key-input-field:focus {
  outline: none;
  border-color: var(--gold-bright);
  box-shadow: 0 0 0 3px var(--gold-glow);
}

.delete-file-target {
  padding: 0.65rem 0.95rem;
  background-color: var(--bg-soft);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  word-break: break-all;
  font-family: var(--font-mono);
  color: var(--navy);
  font-size: 0.88rem;
}

.modal-warning {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.modal-warning code {
  font-family: var(--font-mono);
  background: var(--bg-sunken);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--navy);
  font-weight: 700;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background-color: var(--bg-soft);
}

/* ==============================================================================
 * FOOTER (Site Footer)
 * ============================================================================== */
.app-footer.site-footer {
  margin-top: 2.5rem;
  padding: 1.15rem 1.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

/* ==============================================================================
 * RESPONSIVE BREAKPOINTS (Mobile & Tablet)
 * ============================================================================== */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .chess-wrapper {
    padding: 0.75rem 0.5rem 2.5rem;
  }

  .header-container {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.15rem;
  }

  .header-actions-row {
    width: 100%;
    justify-content: space-between;
  }

  .btn-label-desktop {
    display: none;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .section-card-panel {
    padding: 1.15rem 1rem;
  }

  .action-btn-group {
    flex-direction: column;
    gap: 0.35rem;
  }

  .action-btn-group .btn {
    width: 100%;
  }

  .modern-swiss-table th:nth-child(3),
  .modern-swiss-table td:nth-child(3) {
    display: none;
  }

  .file-name-cell {
    max-width: 140px;
  }
}