:root {
    --bg: #f8f8f5;
    --fg: #222;
    --muted: #6b6b6b;
    --primary: #4c7c6d;
    --accent: #8fb7a3;
    --primary-strong: #3d6658;
    --primary-soft: rgba(76, 124, 109, 0.12);
    --primary-border: rgba(76, 124, 109, 0.14);
    --primary-shadow: rgba(26, 52, 44, 0.08);
    --primary-shadow-strong: rgba(26, 52, 44, 0.1);
    --primary-shadow-soft: rgba(26, 52, 44, 0.06);
    --primary-tint: #f1f4f3;
    --card: #ffffff;
    --border: #e0e0e0;
    --danger: #b23b3b;
    --warning: #b2863b;
}

[data-theme="blue"] {
    --primary: #3f6fa6;
    --accent: #8fb2d9;
    --primary-strong: #325c8b;
    --primary-soft: rgba(63, 111, 166, 0.12);
    --primary-border: rgba(63, 111, 166, 0.14);
    --primary-shadow: rgba(24, 45, 68, 0.08);
    --primary-shadow-strong: rgba(24, 45, 68, 0.1);
    --primary-shadow-soft: rgba(24, 45, 68, 0.06);
    --primary-tint: #f1f5fb;
}

[data-theme="red"] {
    --primary: #a65050;
    --accent: #d49a9a;
    --primary-strong: #8c4040;
    --primary-soft: rgba(166, 80, 80, 0.12);
    --primary-border: rgba(166, 80, 80, 0.14);
    --primary-shadow: rgba(90, 35, 35, 0.08);
    --primary-shadow-strong: rgba(90, 35, 35, 0.1);
    --primary-shadow-soft: rgba(90, 35, 35, 0.06);
    --primary-tint: #fbf2f2;
}

[data-theme="orange"] {
    --primary: #b26a32;
    --accent: #e0b082;
    --primary-strong: #955626;
    --primary-soft: rgba(178, 106, 50, 0.12);
    --primary-border: rgba(178, 106, 50, 0.14);
    --primary-shadow: rgba(100, 60, 25, 0.08);
    --primary-shadow-strong: rgba(100, 60, 25, 0.1);
    --primary-shadow-soft: rgba(100, 60, 25, 0.06);
    --primary-tint: #fbf4ee;
}

[data-theme="gray"] {
    --primary: #6d7178;
    --accent: #b5b9c0;
    --primary-strong: #5a5e64;
    --primary-soft: rgba(109, 113, 120, 0.12);
    --primary-border: rgba(109, 113, 120, 0.14);
    --primary-shadow: rgba(53, 56, 60, 0.08);
    --primary-shadow-strong: rgba(53, 56, 60, 0.1);
    --primary-shadow-soft: rgba(53, 56, 60, 0.06);
    --primary-tint: #f2f3f4;
}

[data-theme="purple"] {
    --primary: #6b5aa9;
    --accent: #b6aad9;
    --primary-strong: #584a8d;
    --primary-soft: rgba(107, 90, 169, 0.12);
    --primary-border: rgba(107, 90, 169, 0.14);
    --primary-shadow: rgba(44, 34, 72, 0.08);
    --primary-shadow-strong: rgba(44, 34, 72, 0.1);
    --primary-shadow-soft: rgba(44, 34, 72, 0.06);
    --primary-tint: #f4f2fb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Inter", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--fg);
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    font-weight: 700;
    letter-spacing: 0.04em;
}

.nav-links a,
.link-button {
    margin-left: 12px;
    color: var(--fg);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 6px;
}

.nav-links a:hover,
.link-button:hover {
    background: var(--border);
}

.inline-form {
    display: inline;
}

.link-button {
    background: transparent;
    border: none;
    cursor: pointer;
}

.container {
    max-width: 1100px;
    margin: 24px auto 48px;
    padding: 0 16px;
}

.welcome-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr);
    gap: 32px;
    align-items: center;
    background: linear-gradient(135deg, #fefcf7 0%, #f1f4ef 50%, #eef4f2 100%);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 32px;
    box-shadow: 0 24px 60px var(--primary-shadow);
}

.welcome-copy h1 {
    font-size: 36px;
    margin-bottom: 12px;
}

.lead {
    font-size: 17px;
    color: var(--muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-soft);
    color: var(--primary);
    font-weight: 600;
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 999px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.feature-list {
    display: grid;
    gap: 16px;
    margin-bottom: 24px;
}

.feature-list h3 {
    margin-bottom: 6px;
}

.quote-grid {
    display: grid;
    gap: 12px;
}

.quote-card {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--primary-border);
    border-radius: 12px;
    padding: 14px 16px;
    box-shadow: 0 12px 30px var(--primary-shadow-soft);
}

.quote-card p {
    margin: 0 0 6px;
    font-weight: 500;
}

.quote-card span {
    color: var(--muted);
    font-size: 12px;
}

.login-panel {
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 18px 48px var(--primary-shadow-strong);
}

.login-header h2 {
    margin-bottom: 6px;
}

.login-form {
    display: grid;
    gap: 12px;
}

.login-footer {
    margin-top: 16px;
    display: grid;
    gap: 8px;
}

.tiny {
    font-size: 11px;
    color: var(--muted);
}

h1,
h2,
h3,
h4 {
    font-weight: 600;
    margin: 0 0 12px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 16px;
}

.error-hero {
    display: grid;
    gap: 20px;
    justify-items: center;
    text-align: center;
    padding: 32px 16px;
    background: linear-gradient(140deg, #fefcf7 0%, #f2f4f1 50%, #edf2ef 100%);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 20px 40px var(--primary-shadow);
}

.error-code {
    font-size: 72px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.08em;
}

.error-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px 28px;
    max-width: 520px;
    box-shadow: 0 16px 30px var(--primary-shadow-soft);
}

.error-card .lead {
    margin: 12px 0 20px;
}

.primary-link {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 10px 18px;
    background: var(--primary);
    color: #fff;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
}

.primary-link:hover {
    background: var(--primary-strong);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
}

input,
select,
textarea,
button {
    width: 100%;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--border);
    font: inherit;
}

textarea {
    min-height: 80px;
}

button.primary {
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
}

button.primary:hover {
    background: var(--primary-strong);
}

button.secondary {
    background: var(--card);
    color: var(--fg);
    border: 1px solid var(--border);
    cursor: pointer;
}

.flash-container {
    margin-bottom: 16px;
}

.flash {
    padding: 12px 14px;
    border-radius: 8px;
    margin-bottom: 8px;
    border: 1px solid var(--border);
}

.flash.success {
    background: #e9f7ef;
    color: #1d6b3a;
}

.flash.danger {
    background: #fdecea;
    color: var(--danger);
}

.flash.warning {
    background: #fff6e5;
    color: var(--warning);
}

.flash.info {
    background: #e8f1fb;
    color: #2d68b3;
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 10px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.tag {
    display: inline-block;
    padding: 4px 8px;
    background: var(--border);
    border-radius: 6px;
    margin-right: 6px;
    font-size: 12px;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 10px;
    font-size: 12px;
    color: white;
}

.habit-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.habit-color-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    box-shadow: 0 0 0 1px var(--border);
    flex-shrink: 0;
}

.streaks {
    color: var(--muted);
    font-size: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

.small {
    font-size: 13px;
    color: var(--muted);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
}

.day {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px;
    min-height: 70px;
    position: relative;
    cursor: pointer;
    transition: all 0.2s ease;
}

.day:not(.empty):hover {
    background: var(--primary-tint);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.day .date-number {
    font-weight: 600;
}

.day .activity {
    position: absolute;
    bottom: 8px;
    right: 10px;
    background: var(--primary);
    color: white;
    padding: 4px 6px;
    border-radius: 6px;
    font-size: 12px;
}

.day .habit-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 6px;
}

.day .habit-color-dot {
    width: 8px;
    height: 8px;
}

.day.empty {
    background: transparent;
    border: none;
    cursor: default;
}

.detail-panel {
    margin-top: 16px;
}

.entries-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.entry-card {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card);
    flex: 1 1 200px;
    /* Grow, shrink, base width 200px */
    max-width: 100%;
    /* Prevent overflow on small screens */
}

.report-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.empty-state {
    padding: 16px;
    border: 1px dashed var(--border);
    border-radius: 8px;
    text-align: center;
    color: var(--muted);
}

.thumbnail {
    max-width: 120px;
    max-height: 120px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

@media (max-width: 600px) {
    .top-nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-links {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
    }
}

@media (max-width: 900px) {
    .welcome-hero {
        grid-template-columns: 1fr;
        padding: 24px;
    }

    .welcome-copy h1 {
        font-size: 30px;
    }
}

/* --- Habit color swatch picker --- */
.color-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.color-help {
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.color-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.color-custom {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
}

.color-custom input[type="color"] {
  width: 30px;
  height: 30px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  box-shadow: 0 0 0 1px var(--border);
}

.color-swatch.selected {
  border-color: var(--text);
}

.color-preview {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.color-preview-chip {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  box-shadow: 0 0 0 1px var(--border);
}

.app-footer {
  margin: 24px auto 32px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}