/* PhD Journey Tracker — stylesheet
   No frameworks. Custom properties for theming (light/dark via prefers-color-scheme). */

:root {
    --color-full: #3B6D11;
    --color-partial: #BA7517;
    --color-zero: #A32D2D;
    --color-neutral: #5F5E5A;

    --bg: #ffffff;
    --bg-panel: #f7f7f5;
    --bg-elevated: #ffffff;
    --text: #1c1c1a;
    --text-muted: #5F5E5A;
    --border: #ddd9d2;
    --link: #2f5e91;
    --focus-ring: #2f6fed;

    --font-stack: system-ui, -apple-system, 'Segoe UI', sans-serif;
    --radius: 6px;
    --spacing: 1rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #17171a;
        --bg-panel: #1f1f23;
        --bg-elevated: #24242a;
        --text: #ececec;
        --text-muted: #a3a29d;
        --border: #34343a;
        --link: #7fb0e8;
        --focus-ring: #7fb0e8;
    }
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-stack);
    line-height: 1.5;
}

a { color: var(--link); }

h1, h2, h3 { line-height: 1.25; }
h1 { font-size: 1.6rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 .75rem; }

button, input, select, textarea {
    font-family: inherit;
    font-size: 1rem;
    color: var(--text);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--focus-ring);
    outline-offset: 2px;
}

/* --- Layout --- */
.app-main { padding: 1.5rem 0 4rem; }
.app-container { max-width: 1080px; margin: 0 auto; padding: 0 1rem; }

.app-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
    padding: .75rem 1rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
}
.app-nav-brand a { font-weight: 700; text-decoration: none; color: var(--text); }
.app-nav-links { list-style: none; display: flex; flex-wrap: wrap; gap: 1rem; margin: 0; padding: 0; }
.app-nav-links a { text-decoration: none; padding: .25rem 0; }
.app-nav-links a[aria-current="page"] { border-bottom: 2px solid var(--color-full); font-weight: 600; }

.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 800px) {
    .dashboard-grid { grid-template-columns: 1fr 1fr; }
    .panel-wide { grid-column: 1 / -1; }
}

.calendar-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}
@media (min-width: 800px) {
    .calendar-layout { grid-template-columns: 3fr 1fr; }
}

/* --- Panels / cards --- */
.panel {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
}
.panel-danger { border-color: var(--color-zero); }

.stats-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: .75rem;
    margin-bottom: 1rem;
}
@media (min-width: 700px) {
    .stats-row { grid-template-columns: repeat(4, 1fr); }
}
.stat-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: .85rem;
    display: flex;
    flex-direction: column;
    gap: .25rem;
}
.stat-value { font-size: 1.6rem; font-weight: 700; }
.stat-label { font-size: .8rem; color: var(--text-muted); }

/* --- Flash / banners --- */
.flash {
    padding: .6rem .9rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: .95rem;
}
.flash-success { background: rgba(59,109,17,.12); border: 1px solid var(--color-full); }
.flash-error { background: rgba(163,45,45,.12); border: 1px solid var(--color-zero); }

.banner {
    padding: .85rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .75rem;
    justify-content: space-between;
}
.banner-urgent {
    background: rgba(163,45,45,.12);
    border: 1px solid var(--color-zero);
    color: var(--text);
}
.banner-cta { font-weight: 700; white-space: nowrap; }

/* --- Forms --- */
.stack-form { display: flex; flex-direction: column; gap: .4rem; }
.stack-form label { font-weight: 600; font-size: .9rem; margin-top: .4rem; }
.stack-form input[type="text"],
.stack-form input[type="email"],
.stack-form input[type="password"],
.stack-form input[type="date"],
.stack-form input[type="number"],
.stack-form select,
.stack-form textarea {
    width: 100%;
    padding: .5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
}
.stack-form textarea { resize: vertical; }
.checkbox-row { display: flex; align-items: center; gap: .5rem; font-weight: 400; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }

.inline-form { display: inline-flex; gap: .4rem; align-items: center; }
.task-add-form { margin-bottom: .75rem; flex-wrap: wrap; }
.task-add-form input[type="text"] { flex: 1; min-width: 150px; padding: .5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }
.task-add-form select { padding: .5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }

.btn {
    display: inline-block;
    padding: .55rem 1rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    font-weight: 600;
    font-size: .95rem;
}
.btn-primary { background: var(--color-full); color: #fff; }
.btn-secondary { background: var(--bg-panel); border-color: var(--border); color: var(--text); }
.btn-danger { background: var(--color-zero); color: #fff; }
.btn-small { padding: .3rem .6rem; font-size: .85rem; }

.auth-card {
    max-width: 420px;
    margin: 3rem auto;
    padding: 1.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.auth-links { margin-top: 1rem; font-size: .9rem; }

/* --- Tasks --- */
.task-list { list-style: none; margin: 0 0 1rem; padding: 0; display: flex; flex-direction: column; gap: .35rem; }
.task-item { display: flex; align-items: center; gap: .5rem; padding: .4rem .5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-panel); }
.task-item.task-done .task-text { text-decoration: line-through; color: var(--text-muted); }
.task-item label { display: flex; align-items: center; gap: .5rem; flex: 1; font-weight: 400; }
.task-checkbox-btn { background: none; border: none; font-size: 1.1rem; cursor: pointer; line-height: 1; padding: 0; }
.task-category { font-size: .75rem; color: var(--text-muted); }
.task-delete { background: none; border: none; color: var(--color-zero); font-size: 1.1rem; cursor: pointer; line-height: 1; }
.task-text { flex: 1; }
.quick-task-row { display: flex; gap: .5rem; }
.quick-task-row input { flex: 1; padding: .5rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }

/* --- Badges --- */
.badge { display: inline-block; padding: .2rem .6rem; border-radius: 999px; font-size: .8rem; font-weight: 600; }
.badge-green { background: rgba(59,109,17,.15); color: var(--color-full); }
.badge-amber { background: rgba(186,117,23,.15); color: var(--color-partial); }
.badge-red { background: rgba(163,45,45,.15); color: var(--color-zero); }
.badge-gray { background: rgba(95,94,90,.15); color: var(--color-neutral); }

/* --- Day header --- */
.day-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }
.day-title { display: flex; flex-direction: column; align-items: center; gap: .25rem; text-align: center; }
.day-title h1 { margin: 0; font-size: 1.25rem; }
.day-nav-arrow { font-size: 1.4rem; text-decoration: none; padding: .25rem .75rem; border-radius: var(--radius); border: 1px solid var(--border); }
.day-nav-disabled { opacity: .3; pointer-events: none; }

.log-summary p { margin: .4rem 0; }

/* --- Mini calendar (dashboard) --- */
.mini-calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; }
.mini-cal-cell {
    position: relative;
    aspect-ratio: 1;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: .25rem;
    font-size: .75rem;
    text-decoration: none;
    color: var(--text);
    border-radius: 4px;
    background: var(--bg-panel);
}
.mini-cal-empty { background: transparent; }
.mini-cal-today { border: 2px solid var(--link); }
.mini-cal-future { color: var(--text-muted); pointer-events: none; }
.mini-cal-dot { position: absolute; bottom: 4px; right: 4px; width: 8px; height: 8px; border-radius: 50%; }

/* --- Full calendar page --- */
.calendar-header { display: flex; align-items: center; justify-content: center; gap: 1.5rem; margin-bottom: 1rem; }
.calendar-header h1 { margin: 0; }
.calendar-weekdays { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; font-size: .8rem; color: var(--text-muted); margin-bottom: .4rem; text-align: center; }
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal-cell {
    position: relative;
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: .4rem;
    border-radius: 4px;
    background: var(--bg-panel);
    text-decoration: none;
    color: var(--text);
}
.cal-cell-empty { background: transparent; }
.cal-cell-future { color: var(--text-muted); }
.cal-cell-today { border: 2px solid var(--link); }
.cal-day-num { font-size: .85rem; font-weight: 600; }
.cal-dot { position: absolute; bottom: 6px; left: 6px; width: 10px; height: 10px; border-radius: 50%; }
.cal-task-badge { position: absolute; bottom: 4px; right: 6px; font-size: .7rem; background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 999px; padding: 0 .3rem; }

.dot-full, .heatmap-full { background: var(--color-full); }
.dot-partial, .heatmap-partial { background: var(--color-partial); }
.dot-none, .heatmap-none { background: var(--color-zero); }

.summary-list { display: grid; grid-template-columns: 1fr auto; gap: .3rem .75rem; margin: 0; }
.summary-list dt { color: var(--text-muted); font-size: .9rem; }
.summary-list dd { margin: 0; font-weight: 600; text-align: right; }

/* --- Milestones --- */
.milestone-list, .milestone-full-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .5rem; }
.milestone-item, .milestone-row { display: flex; align-items: center; gap: .6rem; padding: .5rem; border-radius: var(--radius); border: 1px solid var(--border); background: var(--bg-panel); }
.milestone-row { align-items: flex-start; flex-wrap: wrap; }
.milestone-dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; margin-top: .25rem; }
.milestone-info { flex: 1; min-width: 180px; }
.milestone-name { display: block; }
.milestone-meta { font-size: .8rem; color: var(--text-muted); }
.milestone-description { font-size: .9rem; margin: .3rem 0 0; }
.milestone-actions { display: flex; gap: .4rem; flex-wrap: wrap; align-items: flex-start; }
.milestone-urgent { border-color: var(--color-partial); }
.milestone-overdue { border-color: var(--color-zero); }
.milestone-completed { opacity: .6; }
.milestone-completed .milestone-name { text-decoration: line-through; }
.milestone-days { margin-left: auto; font-size: .8rem; color: var(--text-muted); }
.milestone-edit-details summary { list-style: none; cursor: pointer; }
.milestone-edit-details[open] { flex-basis: 100%; }

/* --- Heatmap --- */
.heatmap { display: flex; flex-wrap: wrap; gap: 4px; }
.heatmap-square { width: 18px; height: 18px; border-radius: 3px; display: inline-block; text-decoration: none; }

/* --- Admin table --- */
.admin-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.admin-table th, .admin-table td { text-align: left; padding: .5rem; border-bottom: 1px solid var(--border); }
.admin-actions { display: flex; gap: .35rem; flex-wrap: wrap; }
.muted { color: var(--text-muted); font-size: .85rem; }

.empty-state { color: var(--text-muted); font-style: italic; }

@media (max-width: 480px) {
    .two-col { grid-template-columns: 1fr; }
    .day-header { flex-wrap: wrap; }
}