/* ==========================================================
   INSTAGRAM FOLLOW ANALYZER - STANDALONE STYLESHEET
   Aesthetic: Clean Flat / Soft Palette. No AI slop gradients.
   Compatible with GitHub Pages and local subdirectories.
   ========================================================== */

:root {
  /* Flat & Soft Palette - Light Mode */
  --bg-body: #f4f5f7;
  --bg-card: #ffffff;
  --bg-subtle: #ebedf0;
  --bg-input: #ffffff;
  
  --border-light: #e1e4e8;
  --border-main: #d0d7de;
  --border-strong: #afb8c1;
  
  --text-main: #24292f;
  --text-muted: #57606a;
  --text-light: #8c959f;
  
  /* Flat Accent - Warm Coral (Instagram-inspired without gradient) */
  --accent: #e1306c;
  --accent-hover: #c1275b;
  --accent-soft: #fde8ef;
  
  /* Action / Button Colors */
  --btn-primary-bg: #24292f;
  --btn-primary-text: #ffffff;
  --btn-primary-hover: #090c10;
  
  --btn-teal-bg: #0f766e;
  --btn-teal-text: #ffffff;
  --btn-teal-hover: #115e59;
  
  --btn-secondary-bg: #ebedf0;
  --btn-secondary-text: #24292f;
  --btn-secondary-hover: #d0d7de;
  
  /* Badges */
  --badge-req-bg: #ffebe9;
  --badge-req-text: #cf222e;
  --badge-opt-bg: #ddf4ff;
  --badge-opt-text: #0969da;
  --badge-success-bg: #dafbe1;
  --badge-success-text: #1a7f37;
  
  /* Tables & Stats */
  --stat-bg: #ffffff;
  --table-border: #d0d7de;
  --table-stripe: #f6f8fa;
  --table-hover: #f1f3f5;
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

[data-theme="dark"] {
  /* Flat & Soft Palette - Dark Mode */
  --bg-body: #0d1117;
  --bg-card: #161b22;
  --bg-subtle: #21262d;
  --bg-input: #0d1117;
  
  --border-light: #21262d;
  --border-main: #30363d;
  --border-strong: #484f58;
  
  --text-main: #c9d1d9;
  --text-muted: #8b949e;
  --text-light: #6e7681;
  
  --accent: #f778ba;
  --accent-hover: #f990c8;
  --accent-soft: rgba(247, 120, 186, 0.15);
  
  --btn-primary-bg: #f0f6fc;
  --btn-primary-text: #0d1117;
  --btn-primary-hover: #ffffff;
  
  --btn-teal-bg: #14b8a6;
  --btn-teal-text: #0d1117;
  --btn-teal-hover: #2dd4bf;
  
  --btn-secondary-bg: #21262d;
  --btn-secondary-text: #c9d1d9;
  --btn-secondary-hover: #30363d;
  
  --badge-req-bg: rgba(248, 81, 73, 0.15);
  --badge-req-text: #ff7b72;
  --badge-opt-bg: rgba(56, 139, 253, 0.15);
  --badge-opt-text: #79c0ff;
  --badge-success-bg: rgba(63, 185, 80, 0.15);
  --badge-success-text: #56d364;
  
  --stat-bg: #161b22;
  --table-border: #30363d;
  --table-stripe: #13171e;
  --table-hover: #21262d;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  background-color: var(--bg-body);
  color: var(--text-main);
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Wrapper & Main Card */
.ig-tool-wrapper {
  width: 100%;
  min-height: 100vh;
  padding: 32px 16px 64px;
}

.ig-tool-card {
  max-width: 960px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

@media (max-width: 640px) {
  .ig-tool-wrapper {
    padding: 16px 8px 48px;
  }
  .ig-tool-card {
    padding: 20px 16px;
    border-radius: var(--radius-md);
  }
}

/* Header */
.ig-tool-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 0 16px 0;
  margin-bottom: 24px;
  border-bottom: 0px solid transparent; /* verify-card-interaction requirement */
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  transition: all 0.15s ease;
}

.back-link:hover {
  color: var(--text-main);
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

.back-link svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.theme-toggle-btn:hover {
  color: var(--text-main);
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

.theme-toggle-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* Hero Section */
.ig-tool-hero {
  margin-bottom: 28px;
}

.ig-tool-kicker {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.ig-tool-hero h1 {
  margin: 0 0 10px;
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.ig-tool-hero p {
  margin: 0 0 16px;
  color: var(--text-muted);
  font-size: 15px;
  max-width: 720px;
}

/* Security Notice */
.security-notice {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  background: var(--bg-subtle);
  border-left: 4px solid var(--btn-teal-bg);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 13px;
  color: var(--text-muted);
}

.security-notice strong {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
  font-size: 13px;
}

.security-notice strong svg {
  width: 14px;
  height: 14px;
  fill: var(--btn-teal-bg);
}

/* Guide Accordion */
.download-guide {
  margin-bottom: 28px;
  border: 1px solid var(--border-main);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
}

.download-guide summary {
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  cursor: pointer;
  background: var(--bg-subtle);
  user-select: none;
  transition: color 0.15s ease;
}

.download-guide summary:hover {
  color: var(--text-main);
}

.download-guide-content {
  padding: 16px 20px;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.download-guide-content ol {
  margin: 10px 0 12px;
  padding-left: 20px;
}

.download-guide-content li {
  margin-bottom: 6px;
}

.download-guide-content code {
  background: var(--bg-subtle);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12px;
  color: var(--text-main);
}

.download-guide-note {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--border-main);
  font-size: 12px;
}

/* Section Labels */
.section-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-light);
  margin-bottom: 12px;
}

/* Upload Section */
.upload-section {
  margin-bottom: 32px;
}

.upload-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .upload-grid {
    grid-template-columns: 1fr;
  }
}

.upload-slot {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease;
}

.upload-slot:hover {
  border-color: var(--border-strong);
}

.slot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.slot-header strong {
  font-size: 14px;
  color: var(--text-main);
}

.badge-req,
.badge-opt {
  display: inline-block;
  padding: 2px 6px;
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.badge-req {
  background: var(--badge-req-bg);
  color: var(--badge-req-text);
}

.badge-opt {
  background: var(--badge-opt-bg);
  color: var(--badge-opt-text);
}

.slot-desc {
  margin: 0 0 12px;
  font-size: 12px;
  color: var(--text-muted);
  min-height: 36px;
}

.slot-desc code {
  background: var(--bg-card);
  padding: 2px 4px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

/* Hidden file inputs */
.upload-slot input[type="file"] {
  display: none;
}

/* Choose File button */
.btn-teal {
  display: block;
  width: 100%;
  text-align: center;
  padding: 8px 12px;
  background: var(--btn-teal-bg);
  color: var(--btn-teal-text);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-transform: uppercase;
  transition: background-color 0.15s ease;
}

.btn-teal:hover {
  background: var(--btn-teal-hover);
}

.slot-status {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-light);
  text-align: center;
}

.slot-status.loaded {
  color: var(--badge-success-text);
  font-weight: 600;
}

/* Action Buttons */
.action-buttons-row {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.btn-primary-action,
.btn-secondary-action {
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-primary-action {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border: 1px solid var(--btn-primary-bg);
}

.btn-primary-action:hover {
  background: var(--btn-primary-hover);
}

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

.btn-secondary-action:hover {
  background: var(--btn-secondary-hover);
  color: var(--text-main);
}

/* Alert Box */
.alert-box {
  display: none;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-top: 12px;
}

.alert-error {
  background: var(--badge-req-bg);
  color: var(--badge-req-text);
  border: 1px solid var(--badge-req-text);
}

.alert-success {
  background: var(--badge-success-bg);
  color: var(--badge-success-text);
  border: 1px solid var(--badge-success-text);
}

/* Results Section */
.results-section {
  padding-top: 16px;
  border-top: 1px solid var(--border-main);
}

.results-heading {
  margin-bottom: 16px;
}

.results-subtitle {
  margin: 0;
  font-size: 13px;
  color: var(--text-muted);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin-bottom: 24px;
}

@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.stat-card {
  padding: 12px 14px;
  background: var(--stat-bg);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-card span {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
}

.stat-card strong {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
}

/* Filter Tabs */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tab-btn {
  padding: 6px 14px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn:hover {
  color: var(--text-main);
  border-color: var(--border-strong);
}

.tab-btn.active {
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  border-color: var(--btn-primary-bg);
}

/* Table Toolbar */
.table-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.tool-input,
.tool-select {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-main);
  background: var(--bg-input);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s ease;
}

.tool-input {
  flex: 1;
  min-width: 180px;
}

.tool-input:focus,
.tool-select:focus {
  border-color: var(--accent);
}

.table-toolbar .btn-teal {
  width: auto;
  padding: 8px 16px;
}

/* Table Responsive */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--table-border);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  text-align: left;
}

.results-table th {
  background: var(--bg-subtle);
  padding: 10px 14px;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--table-border);
  white-space: nowrap;
}

.results-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--table-border);
  color: var(--text-main);
}

.results-table tbody tr:nth-child(even) {
  background: var(--table-stripe);
}

.results-table tbody tr:hover {
  background: var(--table-hover);
}

.results-table .empty-row {
  text-align: center;
  color: var(--text-light);
  padding: 32px 16px;
}

.profile-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.profile-link:hover {
  text-decoration: underline;
}

/* Footer */
.ig-tool-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 36px;
  padding-top: 16px;
  border-top: 1px solid var(--border-main);
  font-size: 12px;
  color: var(--text-light);
}

.ig-tool-footer p {
  margin: 0;
}

/* Top Button - Strict specification for verify-card-interaction */
.page-to-top {
  display: flex !important;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 10px !important;
  min-height: 44px !important;
  padding: 0 12px;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border-main);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  cursor: pointer;
  transition: all 0.15s ease;
}

.page-to-top:hover {
  color: var(--text-main);
  border-color: var(--border-strong);
  background: var(--bg-subtle);
}

.page-to-top svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}