/* ===== CSS VARIABLES ===== */
[data-theme="dark"] {
  --bg: #121212;
  --surface: #181818;
  --surface-2: #232323;
  --border: #2a2a2a;
  --text: #ffffff;
  --text-muted: #a0a0a0;
  --accent: #1DB954;
  --accent-hover: #1ed760;
  --danger: #e05260;
  --warning: #f0a500;
  --card-shadow: 0 4px 24px rgba(0,0,0,0.4);
}

[data-theme="light"] {
  --bg: #f5f0e8;
  --surface: #fffdf7;
  --surface-2: #eee9dc;
  --border: #e0d9cc;
  --text: #1a1a1a;
  --text-muted: #7a7060;
  --accent: #1DB954;
  --accent-hover: #18a349;
  --danger: #e05260;
  --warning: #f0a500;
  --card-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
}

/* ===== NAVIGATION BAR ===== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2.5rem;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2.5rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
  transition: color 0.2s;
  position: relative;
}

/* Green underline on active/hover nav link */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

/* ===== THEME TOGGLE ===== */
.theme-toggle {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.45rem 1rem;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===== CONTAINER ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 2rem;
}

/* ===== PAGE HEADER ===== */
.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.3rem;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 2.5rem;
}

/* ===== CARDS ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(29, 185, 84, 0.08);
}

.card-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.card-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text);
}

.card-change {
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 0.4rem;
}

.card-change.positive { color: var(--accent); }
.card-change.negative { color: var(--danger); }

/* ===== STAT GRID ===== */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

/* ===== CHART GRID ===== */
.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.chart-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text);
}

.chart-container {
  position: relative;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== SPLASH PAGE ===== */
.splash-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background-color: var(--bg);
}

.splash-card {
  background: #121212;
  border: 1px solid #2a2a2a;
  border-radius: 20px;
  padding: 3rem 2.5rem;
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  box-shadow: 0 8px 48px rgba(0, 0, 0, 0.5);
}

.splash-logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.3px;
  margin-bottom: 1.75rem;
}

.splash-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.2;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.splash-subtitle {
  color: #a0a0a0;
  font-size: 0.9rem;
  margin-bottom: 1.75rem;
}

.splash-input {
  width: 100%;
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  color: #ffffff;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
  margin-bottom: 0.5rem;
}

.splash-input:focus {
  outline: none;
  border-color: var(--accent);
}

.splash-input::placeholder {
  color: #555;
}

.splash-error {
  color: var(--danger);
  font-size: 0.82rem;
  min-height: 1.2rem;
  margin-bottom: 0.5rem;
}

.splash-btn {
  width: 100%;
  background: var(--accent);
  color: #000000;
  border: none;
  border-radius: 10px;
  padding: 0.9rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  margin-top: 0.5rem;
  letter-spacing: 0.3px;
}

.splash-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.splash-btn:active {
  transform: translateY(0);
}

/* ===== CALCULATORS PAGE ===== */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.calculator-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
}

.calculator-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.calculator-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.calc-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.calc-input-group label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.calc-input-group input {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
  width: 100%;
}

.calc-input-group input:focus {
  outline: none;
  border-color: var(--accent);
}

.calc-btn {
  width: 100%;
  background: var(--accent);
  color: #000000;
  border: none;
  border-radius: 10px;
  padding: 0.85rem;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  letter-spacing: 0.3px;
}

.calc-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.calc-btn:active {
  transform: translateY(0);
}

.calc-result {
  margin-top: 1.25rem;
  padding: 1rem;
  background: var(--surface-2);
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  line-height: 1.8;
  display: none;
}

.calc-result.visible {
  display: block;
}

.calc-result strong {
  color: var(--accent);
}

/* ===== GOALS PAGE ===== */
.goals-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.goals-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.goals-column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.goals-column-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.add-goal-btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 0.4rem 0.85rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.add-goal-btn:hover {
  background: var(--accent);
  color: #000000;
}

/* ===== GOAL CARDS ===== */
.goal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--card-shadow);
}

.goal-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.goal-card-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.goal-card-amount {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== PROGRESS BARS ===== */
.progress-bar-track {
  width: 100%;
  height: 10px;
  background: var(--surface-2);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 0.5rem;
}

.progress-bar-fill {
  height: 100%;
  border-radius: 99px;
  width: 0%;
  transition: width 1s ease;
}

.progress-bar-fill.green  { background: var(--accent); }
.progress-bar-fill.yellow { background: var(--warning); }
.progress-bar-fill.red    { background: var(--danger); }

.goal-card-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===== MODALS ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: #121212;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 8px 48px rgba(0, 0, 0, 0.5);
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text);
}

.modal-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.modal-error {
  color: var(--danger);
  font-size: 0.82rem;
  min-height: 1.2rem;
  margin-bottom: 0.5rem;
}

.modal-buttons {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.modal-cancel-btn {
  flex: 1;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 10px;
  padding: 0.85rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.modal-cancel-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.modal-buttons .calc-btn {
  flex: 1;
}

/* ====== DELETE BUTTON ===== */
.delete-goal-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  transition: all 0.2s;
}

.delete-goal-btn:hover {
  color: var(--danger);
}

/* ===== NEWS & LEARN PAGE ===== */
.section-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.section-tag {
  background: var(--accent);
  color: #000000;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* ===== NEWS CARDS ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.news-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem;
  box-shadow: var(--card-shadow);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.news-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(29, 185, 84, 0.08);
}

.news-card-source {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent);
}

.news-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}

.news-card-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: auto;
}

.news-loading {
  color: var(--text-muted);
  font-size: 0.9rem;
  grid-column: 1 / -1;
  padding: 1rem 0;
}

/* ===== LEARN CARDS ===== */
.learn-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.learn-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.learn-card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.learn-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.learn-card-text {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {

    .navbar {
        flex-wrap: wrap;
        gap: 0.75rem;
        padding: 1rem;
    }

    .nav-logo {
        font-size: 1.1rem;
    }

    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        font-size: 0.85rem;
    }

    .theme-toggle {
        font-size: 0.75rem;
        padding: 0.35rem 0.75rem;
    }

    .stat-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }

    .chart-grid {
        grid-template-columns: 1fr !important;
    }

    .calculator-grid {
        grid-template-columns: 1fr !important;
    }

    .goals-grid {
        grid-template-columns: 1fr !important;
    }

    .news-grid {
        grid-template-columns: 1fr !important;
    }

    .learn-grid {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 480px) {

    .stat-grid {
        grid-template-columns: 1fr !important;
    }

    .page-title {
        font-size: 1.4rem;
    }

    .card-value {
        font-size: 1.6rem;
    }

    .container {
        padding: 1.5rem 1rem;
    }
}