/* ========================================================
   Nord & Dracula Anti-Eyestrain Palette
   Tối ưu hóa công thái học thị giác - Không chói lóa
   ======================================================== */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Polar Night (Nền trầm dịu) */
  --nord-bg: #242933;           /* Nền trang mềm mại, giảm phát xạ ánh sáng xanh */
  --nord-surface: #2e3440;      /* Mặt thẻ Card & Table */
  --nord-surface-hover: #353c4a;
  --nord-border: #3b4252;       /* Viền ngăn cách tinh tế */
  --nord-border-subtle: rgba(216, 222, 233, 0.08);

  /* Snow Storm (Chữ tuyết mềm, không lóa trắng tinh) */
  --nord-text-main: #eceff4;    
  --nord-text-muted: #9aa5b8;   
  --nord-text-subtle: #738096;

  /* Frost (Xanh băng Bắc Âu) */
  --nord-cyan: #88c0d0;         /* Điểm nhấn chính */
  --nord-blue: #81a1c1;         /* Nút bấm & liên kết */
  --nord-blue-dark: #5e81ac;

  /* Aurora (Điểm nhấn ấm dịu) */
  --nord-orange: #d08770;       /* Streak 🔥 ấm áp dịu mắt */
  --nord-green: #a3be8c;        /* Số sao dương */
  --nord-yellow: #ebcb8b;       /* Hạng 1 Vàng Bắc Âu */
  --nord-red: #bf616a;

  --font-main: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--nord-bg);
  color: var(--nord-text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  padding: 28px 20px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container { max-width: 1220px; margin: 0 auto; }

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.brand { display: flex; align-items: center; gap: 14px; }
.logo { font-size: 36px; filter: drop-shadow(0 2px 8px rgba(208, 135, 112, 0.3)); }
h1 { font-size: 26px; font-weight: 800; letter-spacing: -0.4px; color: var(--nord-text-main); }
.subtitle { color: var(--nord-text-muted); font-size: 14px; font-weight: 500; }

.header-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

/* Visitor Badge */
.visitor-badge {
  background-color: var(--nord-surface);
  border: 1px solid var(--nord-border);
  padding: 8px 14px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--nord-text-muted);
}
.visitor-badge strong { color: var(--nord-cyan); font-family: var(--font-mono); font-size: 15px; }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary {
  background: var(--nord-blue);
  color: #242933;
}
.btn-primary:hover {
  background: var(--nord-cyan);
  color: #242933;
  transform: translateY(-1px);
}
.btn-secondary {
  background-color: var(--nord-surface);
  color: var(--nord-text-main);
  border: 1px solid var(--nord-border);
}
.btn-secondary:hover {
  background-color: var(--nord-surface-hover);
  border-color: var(--nord-cyan);
}
.btn-sm { padding: 5px 10px; font-size: 12px; border-radius: 6px; }
.btn-block { width: 100%; justify-content: center; }

/* Timeframe Bar */
.timeframe-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--nord-surface);
  border: 1px solid var(--nord-border);
  padding: 10px 16px;
  border-radius: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.timeframe-title {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--nord-text-muted);
  letter-spacing: 0.5px;
}
.timeframe-buttons { display: flex; gap: 8px; }
.timeframe-btn {
  background: var(--nord-bg);
  border: 1px solid var(--nord-border);
  color: var(--nord-text-muted);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}
.timeframe-btn:hover { background: var(--nord-surface-hover); color: var(--nord-text-main); }
.timeframe-btn.active {
  background-color: var(--nord-cyan);
  color: #242933;
  border-color: var(--nord-cyan);
  font-weight: 700;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background-color: var(--nord-surface);
  border: 1px solid var(--nord-border);
  padding: 18px 20px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.stat-card.highlight-card {
  border-color: rgba(208, 135, 112, 0.4);
  background: linear-gradient(145deg, #2e3440, rgba(208, 135, 112, 0.08));
}
.stat-label {
  font-size: 12px;
  color: var(--nord-text-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
  font-weight: 600;
}
.stat-value { font-size: 26px; font-weight: 800; color: var(--nord-text-main); font-family: var(--font-mono); }
.unit { font-size: 14px; font-weight: 600; color: var(--nord-orange); }

/* Toolbar */
.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}
.search-box input {
  background-color: var(--nord-surface);
  border: 1px solid var(--nord-border);
  color: var(--nord-text-main);
  padding: 10px 16px;
  border-radius: 8px;
  width: 320px;
  font-size: 14px;
  outline: none;
  font-family: var(--font-main);
}
.search-box input:focus { border-color: var(--nord-cyan); }

.filter-tabs {
  display: flex;
  gap: 6px;
  background-color: var(--nord-surface);
  padding: 4px;
  border-radius: 8px;
  border: 1px solid var(--nord-border);
}
.tab-btn {
  background: transparent;
  border: none;
  color: var(--nord-text-muted);
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
}
.tab-btn.active {
  background-color: var(--nord-bg);
  color: var(--nord-cyan);
}

/* Table */
.table-container {
  background-color: var(--nord-surface);
  border: 1px solid var(--nord-border);
  border-radius: 10px;
  overflow-x: auto;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}
.leaderboard-table th {
  padding: 14px 18px;
  background-color: #272d37;
  color: var(--nord-text-muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  border-bottom: 1px solid var(--nord-border);
  letter-spacing: 0.5px;
}
.leaderboard-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--nord-border-subtle);
  font-size: 14px;
}
.leaderboard-table tr:hover {
  background-color: rgba(136, 192, 208, 0.04);
}

.rank-badge {
  font-weight: 800;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 12px;
  font-family: var(--font-mono);
}
.rank-1 { background-color: var(--nord-yellow); color: #242933; }
.rank-2 { background-color: #d8dee9; color: #2e3440; }
.rank-3 { background-color: var(--nord-orange); color: #242933; }

.repo-link {
  color: var(--nord-cyan);
  text-decoration: none;
  font-weight: 600;
}
.repo-link:hover { text-decoration: underline; color: #a3d7e8; }

.badge-streak {
  background-color: rgba(208, 135, 112, 0.15);
  color: var(--nord-orange);
  padding: 4px 8px;
  border-radius: 6px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
}
.badge-lang {
  background-color: var(--nord-bg);
  color: var(--nord-text-muted);
  border: 1px solid var(--nord-border);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 12px;
  font-family: var(--font-mono);
}

/* Modal */
.modal {
  position: fixed; inset: 0;
  background-color: rgba(15, 17, 23, 0.75);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 16px;
}
.modal.hidden { display: none; }
.modal-content {
  background-color: var(--nord-surface);
  border: 1px solid var(--nord-border);
  border-radius: 12px;
  width: 100%; max-width: 720px;
  box-shadow: 0 20px 30px rgba(0, 0, 0, 0.35);
}
.small-modal { max-width: 460px; }
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px; border-bottom: 1px solid var(--nord-border);
}
.close-btn { background: none; border: none; color: var(--nord-text-muted); font-size: 24px; cursor: pointer; }
.modal-body { padding: 20px; }
.chart-wrapper { position: relative; height: 350px; width: 100%; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; color: var(--nord-text-muted); margin-bottom: 8px; font-weight: 600; }
.form-group input {
  width: 100%; padding: 10px 14px; background: var(--nord-bg);
  border: 1px solid var(--nord-border); border-radius: 6px;
  color: var(--nord-text-main); font-size: 14px; outline: none;
  font-family: var(--font-main);
}
.form-group input:focus { border-color: var(--nord-cyan); }
.status-msg { margin-bottom: 12px; font-size: 13px; padding: 8px 12px; border-radius: 6px; }
.status-msg.hidden { display: none; }
.status-msg.error { background: rgba(191, 97, 106, 0.15); color: #bf616a; border: 1px solid rgba(191, 97, 106, 0.3); }
.status-msg.success { background: rgba(163, 190, 140, 0.15); color: #a3be8c; border: 1px solid rgba(163, 190, 140, 0.3); }