/* ===========================
   Reset & Variables
   =========================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #f0f4ff;
  --bg-pattern: rgba(99, 102, 241, 0.04);
  --card-bg: rgba(255, 255, 255, 0.75);
  --card-border: rgba(255, 255, 255, 0.6);
  --card-shadow: rgba(99, 102, 241, 0.08);
  --text: #1e293b;
  --text-dim: #64748b;
  --text-sub: #475569;
  --border: #e2e8f0;
  --primary: #6366f1;
  --primary-light: rgba(99, 102, 241, 0.1);
  --accent: #10b981;
  --accent-light: rgba(16, 185, 129, 0.12);
  --danger: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.08);
  --header-bg: rgba(240, 244, 255, 0.85);
  --input-bg: #ffffff;
  --table-header: #6366f1;
  --table-odd: #ffffff;
  --table-even: #f8fafc;
  --bar-track: #e2e8f0;
  --winner-glow: rgba(16, 185, 129, 0.2);

  --font-display: 'Fredoka', sans-serif;
  --font-body: 'Nunito', sans-serif;
  --radius: 16px;
  --radius-sm: 10px;
}

/* ===========================
   Dark Mode
   =========================== */
[data-theme="dark"] {
  --bg: #0f172a;
  --bg-pattern: rgba(99, 102, 241, 0.06);
  --card-bg: rgba(30, 41, 59, 0.75);
  --card-border: rgba(51, 65, 85, 0.6);
  --card-shadow: rgba(0, 0, 0, 0.2);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-sub: #cbd5e1;
  --border: #334155;
  --primary-light: rgba(99, 102, 241, 0.15);
  --accent-light: rgba(16, 185, 129, 0.15);
  --danger-light: rgba(239, 68, 68, 0.12);
  --header-bg: rgba(15, 23, 42, 0.85);
  --input-bg: #1e293b;
  --table-header: #4f46e5;
  --table-odd: rgba(30, 41, 59, 0.5);
  --table-even: rgba(15, 23, 42, 0.5);
  --bar-track: #334155;
  --winner-glow: rgba(16, 185, 129, 0.3);
}

/* ===========================
   Background
   =========================== */
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.4s ease, color 0.4s ease;
}

.bg-pattern {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(16, 185, 129, 0.06) 0%, transparent 50%),
    radial-gradient(circle, var(--bg-pattern) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 20px 20px;
}

/* ===========================
   Header
   =========================== */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-size: 1.5rem;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 2px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.3s ease;
}

.theme-btn:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

/* ===========================
   Main
   =========================== */
main {
  flex: 1;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

/* ===========================
   Hero
   =========================== */
.hero {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1rem;
  color: var(--text-dim);
  margin-top: 0.3rem;
}

/* ===========================
   Controls
   =========================== */
.controls {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.btn {
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
  background: #4f46e5;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: 2px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-light);
}

/* ===========================
   Card
   =========================== */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 24px var(--card-shadow);
  transition: background 0.4s ease, border-color 0.4s ease;
}

.matrix-card {
  margin-bottom: 1.2rem;
  overflow: hidden;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ===========================
   Table
   =========================== */
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 400px;
}

th, td {
  padding: 0.7rem 0.8rem;
  text-align: center;
  border: 1px solid var(--border);
  transition: background 0.3s ease;
}

th {
  background: var(--table-header);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  position: relative;
}

th.factor-header {
  background: var(--table-header);
  min-width: 130px;
}

tbody tr:nth-child(odd) td {
  background: var(--table-odd);
}

tbody tr:nth-child(even) td {
  background: var(--table-even);
}

td.factor-cell {
  font-weight: 600;
  text-align: left;
  min-width: 100px;
}

td.weight-cell {
  min-width: 70px;
}

/* ===========================
   Inputs
   =========================== */
input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 0.45rem 0.6rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--input-bg);
  text-align: center;
  transition: all 0.2s ease;
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

input[type="text"] {
  text-align: left;
}

th input[type="text"] {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
  font-weight: 600;
}

th input[type="text"]::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

th input[type="text"]:focus {
  border-color: rgba(255, 255, 255, 0.6);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.15);
}

/* ===========================
   Delete Buttons
   =========================== */
.delete-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  opacity: 0.3;
}

tr:hover .delete-btn {
  opacity: 0.7;
}

.delete-btn:hover {
  opacity: 1;
  background: var(--danger-light);
  color: var(--danger);
}

/* 열 삭제 행 */
.col-delete-row th {
  padding: 0;
}

.delete-header-cell {
  background: transparent !important;
  border: none !important;
  padding: 0 !important;
  height: 28px;
}

.col-delete-btn {
  opacity: 0.3;
}

.col-delete-btn:hover {
  opacity: 1;
  background: var(--danger-light);
  color: var(--danger);
}

/* 행 삭제 셀 (오른쪽 끝) */
.row-delete-cell {
  width: 36px;
  padding: 0.4rem;
  border: none;
  background: transparent !important;
}

/* 행 삭제 헤더 (빈 칸) */
.row-delete-header {
  width: 36px;
  border: none !important;
  background: transparent !important;
}

/* ===========================
   Result Card
   =========================== */
.result-card {
  padding: 1.5rem;
}

.result-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.result-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
  animation: fadeIn 0.4s ease both;
}

.result-item:last-child {
  margin-bottom: 0;
}

.result-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  min-width: 80px;
  text-align: right;
  color: var(--text);
  flex-shrink: 0;
}

.result-bar-track {
  flex: 1;
  height: 32px;
  background: var(--bar-track);
  border-radius: 50px;
  overflow: hidden;
  position: relative;
}

.result-bar-fill {
  height: 100%;
  border-radius: 50px;
  background: var(--primary);
  transition: width 0.6s cubic-bezier(0.25, 1, 0.5, 1);
  min-width: 2px;
}

.result-item.winner .result-bar-fill {
  background: linear-gradient(135deg, var(--accent), #34d399);
  box-shadow: 0 0 16px var(--winner-glow);
}

.result-score {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  min-width: 50px;
  text-align: left;
  color: var(--text-dim);
}

.result-item.winner .result-score {
  color: var(--accent);
}

.result-item.winner .result-name {
  color: var(--accent);
}

.winner-badge {
  font-size: 0.7rem;
  font-family: var(--font-display);
  font-weight: 600;
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.15rem 0.5rem;
  border-radius: 50px;
  margin-left: 0.3rem;
  white-space: nowrap;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===========================
   Footer
   =========================== */
footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
}

footer a {
  color: var(--teal);
  font-weight: 600;
  text-decoration: underline;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 640px) {
  header {
    padding: 0.8rem 1rem;
  }

  main {
    padding: 0 1rem 2rem;
  }

  .hero {
    padding: 2rem 0.5rem 1rem;
  }

  .controls {
    justify-content: center;
  }

  .btn {
    font-size: 0.82rem;
    padding: 0.5rem 0.9rem;
  }

  .result-name {
    min-width: 60px;
    font-size: 0.85rem;
  }

  .result-bar-track {
    height: 26px;
  }
}