/* Theming: CSS variables */
:root {
    color-scheme: light;
    --bg: #f4f4f4;
    --card: #ffffff;
    --text: #333333;
    --muted: #555555;
    --border: #dddddd;
    --border-soft: #e5e5e5;
    --button-bg: #f8f9fa;
    --button-hover: #e9ecef;
    --accent: #007bff;
    --accent-border: #0056b3;
    --weekday-bg: #f8f9fa;
    --weekday-hover: #e9ecef;
    --empty-bg: #f0f0f0;
    --shadow: rgba(0,0,0,0.1);

    --msg-success-fg: #155724;
    --msg-success-bg: #d4edda;
    --msg-success-br: #c3e6cb;

    --msg-error-fg: #721c24;
    --msg-error-bg: #f8d7da;
    --msg-error-br: #f5c6cb;

    --msg-info-fg: #0c5460;
    --msg-info-bg: #d1ecf1;
    --msg-info-br: #bee5eb;
}

html[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0f1115;
    --card: #16181d;
    --text: #e6e8eb;
    --muted: #b3b8c2;
    --border: #2a2f38;
    --border-soft: #1f2430;
    --button-bg: #1b1f27;
    --button-hover: #222734;
    --accent: #4da3ff;
    --accent-border: #337dd6;
    --weekday-bg: #13161c;
    --weekday-hover: #1a1e27;
    --empty-bg: #0c0e12;
    --shadow: rgba(0,0,0,0.4);

    --msg-success-fg: #c1f1d3;
    --msg-success-bg: #0f2a20;
    --msg-success-br: #1b3f2e;

    --msg-error-fg: #f4c2c2;
    --msg-error-bg: #2c1517;
    --msg-error-br: #472024;

    --msg-info-fg: #c7e7ff;
    --msg-info-bg: #112433;
    --msg-info-br: #1b3447;
}

/* Base */
body {
    font-family: sans-serif;
    padding: 20px;
    background-color: var(--bg);
    color: var(--text);
}

h1, h2 {
    text-align: center;
    color: var(--text);
}

/* Controls wrapper */
.controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px 30px;
    margin-bottom: 30px;
    background-color: var(--card);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    border: 1px solid var(--border-soft);
}

/* Control groups */
.user-select-area,
.preference-select {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.controls label {
    font-weight: bold;
    color: var(--muted);
    font-size: 0.95em;
}

/* Button groups */
.button-group {
    display: inline-flex;
    border-radius: 5px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.button-group button {
    padding: 8px 15px;
    border: none;
    background-color: var(--button-bg);
    color: var(--text);
    cursor: pointer;
    border-right: 1px solid var(--border);
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    font-size: 0.9em;
    line-height: 1.4;
}

.button-group button:last-child {
    border-right: none;
}

.button-group button:hover {
    background-color: var(--button-hover);
}

/* Active state */
.button-group button.active {
    background-color: var(--accent);
    color: #ffffff;
    border-color: var(--accent-border);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
}

/* Layout for months */
#calendar-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.month {
    background-color: var(--card);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--shadow);
    border: 1px solid var(--border-soft);
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 5px;
    margin-top: 10px;
}

.day-name {
    font-weight: bold;
    text-align: center;
    padding: 5px;
    color: var(--muted);
    font-size: 0.9em;
}

.day {
    border: 1px solid var(--border);
    padding: 8px;
    text-align: center;
    min-height: 60px;
    position: relative;
    cursor: pointer;
    background-color: var(--card);
    transition: background-color 0.2s ease, border-color 0.2s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-size: 0.9em;
    border-radius: 3px;
}

.day.empty {
    background-color: var(--empty-bg);
    border: 1px solid var(--border);
    cursor: default;
}

.day:not(.empty):hover {
    background-color: var(--button-hover);
    border-color: var(--border);
}

.indicators {
    margin-top: 5px;
    font-size: 0.7em;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2px;
    min-height: 10px;
}

.indicator {
    display: inline-block;
    padding: 1px 3px;
    border-radius: 3px;
    color: white;
    font-weight: bold;
}

/* User colors */
.indicator.jack { background-color: #007bff; } /* Blue */
.indicator.payton { background-color: #28a745; } /* Green */
.indicator.nick { background-color: #ffc107; color: #111; } /* Yellow dark text */
.indicator.alyssa { background-color: #dc3545; } /* Red */

/* Preferences */
.indicator.prefer_not {
   opacity: 0.25;
}
.indicator.no {
   border: 1px solid rgba(0,0,0,0.5);
   box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.3);
}

/* Message area */
.message-area {
    margin-top: 20px;
    padding: 10px;
    text-align: center;
    font-weight: bold;
    min-height: 1.5em;
    border-radius: 5px;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.message-area.success {
    color: var(--msg-success-fg);
    background-color: var(--msg-success-bg);
    border: 1px solid var(--msg-success-br);
}
.message-area.error {
    color: var(--msg-error-fg);
    background-color: var(--msg-error-bg);
    border: 1px solid var(--msg-error-br);
}
.message-area.info {
    color: var(--msg-info-fg);
    background-color: var(--msg-info-bg);
    border: 1px solid var(--msg-info-br);
}

/* Weekday background variant */
.day.weekday {
    background-color: var(--weekday-bg);
}
.day.weekday:hover:not(.empty) {
    background-color: var(--weekday-hover);
}

/* Responsive */
@media (max-width: 768px) {
    .controls { gap: 15px 20px; padding: 15px; }
}
@media (max-width: 600px) {
    .controls {
        flex-direction: column;
        align-items: stretch;
        gap: 20px;
    }
    .user-select-area, .preference-select { align-items: center; }
    .button-group {
        width: 100%;
        max-width: 400px;
        margin: 0 auto;
        display: flex;
    }
    .button-group button {
        flex-grow: 1;
        text-align: center;
        padding: 10px 5px;
        font-size: 0.85em;
    }
    #calendar-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .day { min-height: 50px; padding: 5px; }
}

/* Auth bar */
.auth-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: center;
    background: var(--card);
    border: 1px solid var(--border-soft);
    border-radius: 8px;
    padding: 10px 12px;
    margin: 0 auto 16px auto;
    max-width: 900px;
    box-shadow: 0 2px 4px var(--shadow);
    flex-wrap: wrap;
}
.auth-status { font-weight: 600; color: var(--text); }
.auth-login input[type="password"] {
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg);
    color: var(--text);
}
.auth-login button,
.auth-logout {
    padding: 6px 10px;
    border: 1px solid var(--border);
    background: var(--button-bg);
    border-radius: 4px;
    cursor: pointer;
    color: var(--text);
}
.auth-login button:hover,
.auth-logout:hover { background: var(--button-hover); }

/* Theme toggle button */
.theme-toggle {
    padding: 6px 10px;
    border: 1px solid var(--border);
    background: var(--button-bg);
    border-radius: 999px;
    cursor: pointer;
    color: var(--text);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}
.theme-toggle:hover { background: var(--button-hover); }