/* ═══════════════════════════════════════════════
   THEME VARIABLES
═══════════════════════════════════════════════ */
:root {
  --bg-body:        #0f0c29;
  --bg-sidebar:     rgba(0,0,0,0.50);
  --bg-card:        rgba(255,255,255,0.05);
  --bg-card-ready:  rgba(0,230,118,0.07);
  --bg-topbar:      rgba(0,0,0,0.35);
  --bg-input:       rgba(0,0,0,0.30);
  --bg-table-head:  rgba(247,151,30,0.15);
  --bg-table-alt:   rgba(255,255,255,0.03);
  --bg-table-hover: rgba(255,255,255,0.05);
  --bg-modal:       #1e1b3a;
  --bg-welcome:     transparent;
  --bg-welcome-card:rgba(255,255,255,0.04);
  --bg-welcome-card-hover: rgba(247,151,30,0.08);
  --bg-note:        rgba(255,210,0,0.07);
  --bg-overlay:     rgba(0,0,0,0.55);

  --border-default: rgba(255,255,255,0.10);
  --border-ready:   #00e676;
  --border-gold:    rgba(255,210,0,0.25);
  --border-sidebar: rgba(255,210,0,0.15);
  --border-table:   rgba(255,210,0,0.20);
  --border-modal:   rgba(255,210,0,0.30);

  --text-body:      #e0e0e0;
  --text-muted:     #888;
  --text-label:     #aaa;
  --text-section:   #555;
  --text-footer:    #444;
  --text-td:        #ddd;
  --text-td-name:   #ffffff;
  --text-td-result: #00e676;
  --text-th:        #ffd200;
  --text-toast:     #ffffff;
  --text-placeholder: #555;

  --gold-start:     #f7971e;
  --gold-end:       #ffd200;
  --accent-teal:    #43cea2;
  --accent-blue:    #185a9d;

  --sidebar-w:      235px;
  --topbar-h:       52px;
  --radius-card:    12px;
  --radius-btn:     8px;
  --transition:     0.25s ease;
}

[data-theme="light"] {
  --bg-body:        #f0f2f5;
  --bg-sidebar:     #ffffff;
  --bg-card:        rgba(0,0,0,0.04);
  --bg-card-ready:  rgba(0,180,90,0.07);
  --bg-topbar:      #ffffff;
  --bg-input:       rgba(0,0,0,0.04);
  --bg-table-head:  rgba(247,151,30,0.12);
  --bg-table-alt:   rgba(0,0,0,0.02);
  --bg-table-hover: rgba(0,0,0,0.04);
  --bg-modal:       #ffffff;
  --bg-welcome:     transparent;
  --bg-welcome-card:#ffffff;
  --bg-welcome-card-hover: rgba(247,151,30,0.06);
  --bg-note:        rgba(255,210,0,0.08);
  --bg-overlay:     rgba(0,0,0,0.40);

  --border-default: rgba(0,0,0,0.12);
  --border-ready:   #00a854;
  --border-gold:    rgba(200,140,0,0.30);
  --border-sidebar: rgba(200,140,0,0.20);
  --border-table:   rgba(200,140,0,0.25);
  --border-modal:   rgba(200,140,0,0.30);

  --text-body:      #1a1a2e;
  --text-muted:     #666;
  --text-label:     #555;
  --text-section:   #999;
  --text-footer:    #aaa;
  --text-td:        #333;
  --text-td-name:   #1a1a2e;
  --text-td-result: #008840;
  --text-th:        #b36000;
  --text-toast:     #1a1a2e;
  --text-placeholder: #aaa;

  --bg-overlay:     rgba(0,0,0,0.35);
}

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

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg-body);
  min-height: 100vh;
  color: var(--text-body);
  display: flex;
  overflow: hidden;
  transition: background var(--transition), color var(--transition);
}

[data-theme="dark"] body { background: linear-gradient(135deg, #0f0c29, #302b63, #24243e); }
[data-theme="light"] body { background: #f0f2f5; }

/* ═══════════════════════════════════════════════
   SIDEBAR
═══════════════════════════════════════════════ */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-sidebar);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: fixed;
  left: 0; top: 0;
  z-index: 200;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
  overflow: hidden;
}

[data-theme="dark"] #sidebar { box-shadow: 2px 0 20px rgba(0,0,0,0.4); }
[data-theme="light"] #sidebar { box-shadow: 2px 0 20px rgba(0,0,0,0.08); }

/* Logo */
.sidebar-logo {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border-sidebar);
  text-align: center;
  flex-shrink: 0;
}
.logo-title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
  line-height: 1.5;
}
.logo-sub {
  font-size: 10px;
  color: var(--text-section);
  letter-spacing: 1px;
  margin-top: 4px;
  text-transform: uppercase;
}

/* Nav */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 10px 0;
}
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--border-gold); border-radius: 4px; }

.nav-section-label {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-section);
  padding: 10px 18px 5px;
  user-select: none;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  font-size: 13px;
  color: var(--text-muted);
  user-select: none;
  text-decoration: none;
}
.nav-item:hover {
  background: rgba(247,151,30,0.07);
  color: var(--text-body);
  border-left-color: rgba(247,151,30,0.35);
}
.nav-item.active {
  background: rgba(247,151,30,0.12);
  color: var(--gold-end);
  border-left-color: var(--gold-end);
  font-weight: 700;
}
.nav-icon { font-size: 16px; min-width: 22px; text-align: center; }
.nav-label { flex: 1; line-height: 1.3; }
.nav-badge {
  font-size: 9px;
  background: rgba(247,151,30,0.15);
  color: var(--gold-start);
  padding: 2px 7px;
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
.nav-item.active .nav-badge {
  background: rgba(255,210,0,0.20);
  color: var(--gold-end);
}

/* Sidebar Footer */
.sidebar-bottom {
  padding: 12px 18px;
  border-top: 1px solid var(--border-sidebar);
  flex-shrink: 0;
}
.sidebar-copyright { font-size: 10px; color: var(--text-footer); text-align: center; letter-spacing: 0.5px; line-height: 1.5; }

/* ═══════════════════════════════════════════════
   MAIN LAYOUT
═══════════════════════════════════════════════ */
#main {
  margin-left: var(--sidebar-w);
  flex: 1;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: margin-left var(--transition);
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  height: var(--topbar-h);
  background: var(--bg-topbar);
  border-bottom: 1px solid var(--border-default);
  flex-shrink: 0;
  transition: background var(--transition), border-color var(--transition);
}
[data-theme="light"] .topbar { box-shadow: 0 1px 8px rgba(0,0,0,0.06); }

#hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--gold-end);
  font-size: 22px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background var(--transition);
  flex-shrink: 0;
}
#hamburger:hover { background: rgba(247,151,30,0.12); }

/* Theme button — top right of topbar */
.topbar-spacer { flex: 1; }

.btn-theme {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: 20px;
  padding: 5px 14px 5px 10px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-body);
  font-weight: 600;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-theme:hover {
  background: rgba(247,151,30,0.12);
  border-color: var(--border-gold);
  box-shadow: 0 0 0 3px rgba(247,151,30,0.12);
}
.btn-theme #theme-icon { font-size: 16px; line-height: 1; }
.btn-theme #theme-label { font-size: 12px; letter-spacing: 0.3px; }

.topbar-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
}
.topbar-sep { color: var(--text-section); font-size: 12px; }
.topbar-sub { font-size: 11px; color: var(--text-muted); }

/* Scrollable content area */
.content-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
}
.content-area::-webkit-scrollbar { width: 5px; }
.content-area::-webkit-scrollbar-thumb { background: var(--border-gold); border-radius: 4px; }

/* Sections */
.page-section {
  display: none;
  padding: 28px 28px 60px;
  min-height: 100%;
}
.page-section.active { display: block; }

/* ═══════════════════════════════════════════════
   WELCOME / BERANDA
═══════════════════════════════════════════════ */
.welcome-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--topbar-h) - 88px);
  gap: 18px;
  text-align: center;
  padding: 20px;
}
.welcome-emoji { font-size: 60px; filter: drop-shadow(0 0 20px rgba(247,151,30,0.4)); }
.welcome-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 3px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
  line-height: 1.3;
}
.welcome-sub {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  max-width: 460px;
  line-height: 1.8;
}
.welcome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  width: 100%;
  max-width: 740px;
  margin-top: 8px;
}
.welcome-card {
  background: var(--bg-welcome-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
  padding: 18px 14px;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  text-align: center;
}
.welcome-card:hover {
  background: var(--bg-welcome-card-hover);
  border-color: var(--border-gold);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(247,151,30,0.15);
}
.wc-icon { font-size: 28px; margin-bottom: 8px; }
.wc-name { font-size: 11px; font-weight: 700; color: var(--gold-end); letter-spacing: 1px; text-transform: uppercase; }
.wc-badge { font-size: 10px; color: var(--text-muted); margin-top: 5px; }

/* ═══════════════════════════════════════════════
   PAGE HEADER
═══════════════════════════════════════════════ */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}
.page-heading {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 2px;
  background: linear-gradient(90deg, var(--gold-start), var(--gold-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-transform: uppercase;
  line-height: 1.3;
}
.page-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; letter-spacing: 0.5px; }

/* ═══════════════════════════════════════════════
   BUTTONS
═══════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius-btn);
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.5px;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-gold {
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  color: #1a1a2e;
  box-shadow: 0 4px 16px rgba(247,151,30,0.40);
  padding: 10px 22px;
  font-size: 13px;
}
.btn-gold:hover { box-shadow: 0 8px 24px rgba(247,151,30,0.60); }

.btn-process {
  padding: 13px 44px;
  font-size: 15px;
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  color: #1a1a2e;
  box-shadow: 0 4px 20px rgba(247,151,30,0.45);
  border: none;
  border-radius: 10px;
  font-weight: 800;
  cursor: pointer;
  letter-spacing: 1px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.btn-process:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(247,151,30,0.65); }

.btn-teal {
  background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
  color: #fff;
  box-shadow: 0 3px 12px rgba(67,206,162,0.35);
  padding: 9px 18px;
  font-size: 13px;
}
.btn-teal:hover { box-shadow: 0 6px 18px rgba(67,206,162,0.55); }

.btn-gold-sm {
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  color: #1a1a2e;
  box-shadow: 0 3px 12px rgba(247,151,30,0.35);
  padding: 9px 18px;
  font-size: 13px;
}
.btn-gold-sm:hover { box-shadow: 0 6px 18px rgba(247,151,30,0.55); }

/* ═══════════════════════════════════════════════
   LAYOUT GRID
═══════════════════════════════════════════════ */
.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.col-group { display: flex; flex-direction: column; gap: 14px; }
.col-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-section);
  margin-bottom: 2px;
}

/* ═══════════════════════════════════════════════
   CARDS
═══════════════════════════════════════════════ */
.card {
  background: var(--bg-card);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-card);
  padding: 14px 16px;
  transition: border-color var(--transition), background var(--transition);
}
.card.ready {
  border-color: var(--border-ready);
  background: var(--bg-card-ready);
}
.card-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--gold-end);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.card-info {
  font-size: 12px;
  color: var(--text-label);
  margin-top: 8px;
  line-height: 1.7;
  white-space: pre-line;
}
.card-info .val { color: var(--gold-end); font-weight: 700; }

/* Note card */
.note-card {
  background: var(--bg-note);
  border: 1.5px solid var(--border-gold);
  border-radius: var(--radius-card);
  padding: 14px 16px;
  font-size: 12px;
  line-height: 1.8;
  color: var(--text-label);
}
.note-card strong { color: var(--gold-end); }
.note-card .nt { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 700; }

/* Level card */
.level-card {
  background: var(--bg-note);
  border: 1.5px solid var(--border-gold);
  border-radius: var(--radius-card);
  padding: 14px 16px;
  font-size: 12px;
  color: var(--text-label);
}
.level-card .lc-title { display: block; font-size: 13px; font-weight: 700; color: var(--gold-end); margin-bottom: 10px; }
.level-row { display: flex; align-items: center; border-bottom: 1px solid var(--border-default); padding: 6px 0; gap: 8px; }
.level-row:last-of-type { border-bottom: none; }
.lvl-badge {
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  color: #1a1a2e;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 20px;
  min-width: 38px;
  text-align: center;
  flex-shrink: 0;
}
.lvl-range { flex: 1; font-size: 11px; color: var(--text-muted); }
.lvl-reward { color: var(--text-td-result); font-weight: 700; font-size: 12px; }
.note-mini {
  margin-top: 10px;
  background: rgba(255,255,255,0.04);
  border-left: 3px solid var(--gold-end);
  border-radius: 0 8px 8px 0;
  padding: 8px 10px;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.6;
}
[data-theme="light"] .note-mini { background: rgba(0,0,0,0.04); }

/* ═══════════════════════════════════════════════
   FILE INPUT
═══════════════════════════════════════════════ */
.file-input {
  width: 100%;
  font-size: 12px;
  color: var(--text-label);
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: 6px;
  padding: 6px 8px;
  cursor: pointer;
  transition: border-color var(--transition);
}
.file-input::-webkit-file-upload-button {
  background: linear-gradient(135deg, var(--gold-start), var(--gold-end));
  color: #1a1a2e;
  border: none;
  padding: 5px 12px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  margin-right: 8px;
}
.file-input.ready { border-color: var(--border-ready); }

/* ═══════════════════════════════════════════════
   PASTE INPUT
═══════════════════════════════════════════════ */
.paste-textarea {
  width: 100%;
  height: 190px;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  color: var(--text-body);
  font-size: 13px;
  font-family: 'Courier New', monospace;
  padding: 10px;
  resize: vertical;
  outline: none;
  transition: border-color var(--transition);
  line-height: 1.6;
}
.paste-textarea:focus { border-color: var(--gold-end); }
.paste-textarea::placeholder { color: var(--text-placeholder); }
.paste-hint { font-size: 11px; color: var(--text-section); line-height: 1.6; margin-top: 6px; }
.paste-hint strong { color: var(--gold-end); }

/* ═══════════════════════════════════════════════
   PROCESS WRAP
═══════════════════════════════════════════════ */
.process-wrap { text-align: center; margin: 8px 0 22px; }

/* ═══════════════════════════════════════════════
   RESULT SECTION
═══════════════════════════════════════════════ */
.result-section { display: none; }
.result-section.visible { display: block; }

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-card);
}
.result-total { font-size: 14px; color: var(--text-body); line-height: 1.8; }
.result-total strong { color: var(--gold-end); font-size: 16px; }
.result-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ═══════════════════════════════════════════════
   TABLE
═══════════════════════════════════════════════ */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-default);
}
.result-table { width: 100%; border-collapse: collapse; }
.result-table thead th {
  background: var(--bg-table-head);
  color: var(--text-th);
  padding: 11px 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-bottom: 1px solid var(--border-table);
  white-space: nowrap;
  text-align: center;
}
.result-table thead th:nth-child(2) { text-align: left; }
.result-table tbody tr {
  border-bottom: 1px solid var(--border-default);
  transition: background var(--transition);
}
.result-table tbody tr:nth-child(even) { background: var(--bg-table-alt); }
.result-table tbody tr:hover { background: var(--bg-table-hover); }
.result-table tbody td {
  padding: 9px 10px;
  font-size: 13px;
  text-align: center;
  color: var(--text-td);
}
.result-table tbody td:nth-child(2) { text-align: left; color: var(--text-td-name); font-weight: 600; }
.result-table tbody td:last-child { color: var(--text-td-result); font-weight: 700; }

/* ═══════════════════════════════════════════════
   MODAL
═══════════════════════════════════════════════ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: var(--bg-overlay);
  backdrop-filter: blur(4px);
}
.modal-overlay.open { display: flex; align-items: center; justify-content: center; }
.modal-box {
  background: var(--bg-modal);
  width: 90%;
  max-width: 560px;
  max-height: 88vh;
  border-radius: 14px;
  border: 1px solid var(--border-modal);
  padding: 24px;
  overflow-y: auto;
  position: relative;
  animation: modalIn 0.2s ease;
  transition: background var(--transition), border-color var(--transition);
}
@keyframes modalIn { from { transform: scale(0.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-title { font-size: 15px; font-weight: 700; color: var(--gold-end); margin-bottom: 16px; }
.modal-text { font-size: 13px; color: var(--text-label); margin-bottom: 8px; line-height: 1.7; }
.modal-text strong { color: var(--gold-end); }
.modal-img { width: 100%; border: 1px solid var(--border-default); border-radius: 8px; margin-bottom: 14px; }
.modal-close {
  position: absolute;
  top: 14px; right: 18px;
  font-size: 22px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition);
  border: none;
  background: none;
  font-weight: 700;
}
.modal-close:hover { color: var(--gold-end); }
.modal-close-btn {
  display: block;
  margin: 8px auto 0;
  padding: 8px 22px;
  background: var(--bg-card);
  color: var(--text-label);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-btn);
  cursor: pointer;
  font-size: 13px;
  transition: background var(--transition);
}
.modal-close-btn:hover { background: var(--bg-table-hover); }

/* ═══════════════════════════════════════════════
   TOAST
═══════════════════════════════════════════════ */
#toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
  color: #fff;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(0,0,0,0.35);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 99999;
  max-width: 320px;
}
#toast.show { opacity: 1; transform: translateY(0); }

/* ═══════════════════════════════════════════════
   SIDEBAR COLLAPSIBLE — works on ALL screen sizes
═══════════════════════════════════════════════ */

/* Default: sidebar visible, main has left margin */
body:not(.sidebar-closed) #sidebar { transform: translateX(0); }
body:not(.sidebar-closed) #main    { margin-left: var(--sidebar-w); }

/* Closed state: sidebar slides out, main fills full width */
body.sidebar-closed #sidebar { transform: translateX(-100%); box-shadow: none; }
body.sidebar-closed #main    { margin-left: 0; }

/* Mobile overlay — only shows on small screens */
#mob-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 199;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}
@media (max-width: 768px) {
  /* On mobile, sidebar is always closed by default — JS opens it */
  #mob-overlay.active {
    display: block;
    opacity: 1;
    pointer-events: auto;
  }
  .page-section { padding: 20px 16px 60px; }
  .welcome-grid { grid-template-columns: repeat(2, 1fr); }
  .welcome-title { font-size: 20px; }
  .btn-theme #theme-label { display: none; }
}

/* ═══════════════════════════════════════════════
   RESPONSIVE LAYOUT
═══════════════════════════════════════════════ */
@media (max-width: 900px) {
  .tool-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .welcome-grid { grid-template-columns: 1fr 1fr; }
  .result-actions { width: 100%; }
  .result-actions .btn { flex: 1; justify-content: center; }
}