/* ===== Co-Schedule — Light & Simple ===== */
:root {
    --header-h: 120px;

    --color-primary: #5b8fc7;
    --color-primary-dark: #4a7db5;
    --color-primary-hover: #3d6fa3;

    --color-line: #06c755;
    --color-line-dark: #05b34c;
    --color-line-hover: #049945;

    --color-accent: #6ba3be;
    --color-accent-dark: #5a92ad;

    --color-bg: #f4f6f8;
    --color-white: #ffffff;
    --color-text: #334155;
    --color-text-muted: #64748b;
    --color-border: #a8b8c8;
    --color-border-light: #b8c6d4;

    --color-surface: #ffffff;
    --color-surface-muted: #f1f5f9;

    --color-gray-dark: #8fa0b4;
    --color-gray-darker: #7d90a6;
    --color-gray-header: #d8e0ea;
    --color-time-col: #e8edf3;

    --color-available: #b8ddf5;
    --color-available-alt: #9ecff0;
    --color-selected: #5eb8e0;
    --color-selected-alt: #42a8d8;
    --color-bad: #e89090;
    --color-bad-alt: #dc7070;
    --color-bad-summary: #f4b0b0;
    --color-unknown: #e8c860;
    --color-unknown-alt: #ddb840;
    --color-unknown-summary: #f0d878;
    --color-header-Sunday: #ffc8ce;
    --color-header-Saturday: #b8cff0;

    --color-mode-bad-bg: #ffe8e8;
    --color-mode-bad-border: #d87070;
    --color-mode-unknown-bg: #fff4d0;
    --color-mode-unknown-border: #c8a030;

    --color-overlay-bg: rgba(51, 65, 85, 0.35);
    --color-shadow: rgba(15, 23, 42, 0.08);
    --color-shadow-md: rgba(15, 23, 42, 0.12);
    --color-input-focus: #5b8fc7;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 20px;
    --spacing-xl: 32px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 999px;

    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --fab-offset: 56px;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    cursor: default;
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

body.app-page {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
}

body.home-page,
body.form-page {
    overflow: auto;
}

/* ===== Typography ===== */
h1, h2, h3 {
    margin: var(--spacing-sm) 0;
    color: var(--color-text);
    font-weight: 600;
    line-height: 1.35;
}

h2 { font-size: clamp(1.15rem, 3vw, 1.4rem); }
h3 { font-size: clamp(0.95rem, 2.5vw, 1.1rem); font-weight: 500; }

p, .header strong {
    margin: var(--spacing-xs) 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ===== Buttons ===== */
button, .btn {
    cursor: pointer;
    font-family: inherit;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    padding: 0.45rem 0.8rem;
    white-space: nowrap;
    transition: background 0.15s ease, border-color 0.15s ease;
}

button:active { opacity: 0.9; }

.headerTop button,
.header .button-container .preweek-btn,
.header .button-container .nextweek-btn,
.header .button-container .copy-btn,
.header .button-container .paste-btn,
#showRespondentsBtn,
.copy-url-btn,
.share-btn,
.btn-primary {
    color: var(--color-white);
    background: var(--color-primary);
    border-color: var(--color-primary-dark);
}

.headerTop button:hover,
.header .button-container .preweek-btn:hover,
.header .button-container .nextweek-btn:hover,
.header .button-container .copy-btn:hover,
.header .button-container .paste-btn:hover,
#showRespondentsBtn:hover,
.copy-url-btn:hover,
.share-btn:hover,
.btn-primary:hover {
    background: var(--color-primary-hover);
}

.submit-btn,
.btn-accent {
    color: var(--color-white) !important;
    background: var(--color-accent) !important;
    border-color: var(--color-accent-dark) !important;
    font-weight: 600;
}

.submit-btn:hover,
.btn-accent:hover {
    background: var(--color-accent-dark) !important;
}

.btn-line,
.cta-button-line,
a.btn-line {
    color: var(--color-white) !important;
    background: var(--color-line) !important;
    border-color: var(--color-line-dark) !important;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-line:hover,
.cta-button-line:hover,
a.btn-line:hover {
    background: var(--color-line-dark) !important;
    color: var(--color-white) !important;
}

.edit-slots-btn,
.btn-ghost {
    background: var(--color-surface) !important;
    color: var(--color-text) !important;
    border-color: var(--color-border) !important;
}

.edit-slots-btn:hover,
.btn-ghost:hover {
    background: var(--color-surface-muted) !important;
}

.logout-btn,
.btn-danger {
    background: #e57373 !important;
    color: var(--color-white) !important;
    border-color: #d32f2f !important;
    text-decoration: none;
    padding: 0.45rem 0.9rem;
    font-size: 0.8125rem;
    font-weight: 500;
}

.logout-btn:hover,
.btn-danger:hover {
    background: #d32f2f !important;
}

/* ===== Header ===== */
.header {
    z-index: 90;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 3px var(--color-shadow);
}

body.app-page .header {
    position: relative;
    flex-shrink: 0;
    height: auto;
    min-height: 0;
    overflow: visible;
    padding-bottom: var(--spacing-sm);
}

.headerTop {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.headerTop h2 {
    margin: 0;
    flex: 1 1 auto;
    min-width: 0;
}

.header .button-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    margin: var(--spacing-xs) 0 0;
}

.header .button-container button {
    margin: 0;
    padding: 0.4rem 0.7rem;
    font-size: clamp(0.68rem, 2vw, 0.8125rem);
    flex: 0 1 auto;
}

.header .button-container .edit-slots-btn {
    margin-left: auto;
}

.header .button-container .nextweek-btn {
    margin-right: var(--spacing-sm);
}

.header #title {
    margin: var(--spacing-xs) 0 2px;
    font-size: clamp(0.85rem, 2.5vw, 1rem);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--color-text-muted);
    font-weight: 500;
}

.share-buttons-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: auto;
    flex-shrink: 0;
}

/* ===== Forms ===== */
input, select, textarea {
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem;
}

input::placeholder {
    color: #94a3b8;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--color-input-focus);
    box-shadow: 0 0 0 3px rgba(91, 143, 199, 0.2);
}

/* ===== Grid ===== */
body.app-page .week-viewport {
    flex: 1;
    min-height: 0;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
    background: var(--color-white);
}

body.app-page .table-viewport {
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

body.app-page.has-fab .table-viewport {
    padding-bottom: var(--fab-offset);
}

.week-slider {
    display: flex;
    width: 300%;
    height: 100%;
    will-change: transform;
}

.week-table {
    width: 33.333333%;
    flex-shrink: 0;
    border-collapse: collapse;
}

table {
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
    margin-top: 0;
}

th, td {
    cursor: pointer;
    border: 1px solid var(--color-border);
    height: 28px;
    min-width: 0;
    text-align: center;
    font-size: 0.7rem;
    color: var(--color-text);
    user-select: none;
    -webkit-user-select: none;
}

td.disabled {
    background: var(--color-gray-dark);
    color: #5a6a7a;
    cursor: not-allowed;
}

tr:nth-child(even) td.disabled {
    background: var(--color-gray-darker);
}

td.available {
    background: var(--color-available);
    color: var(--color-text);
}

tr:nth-child(even) td.available {
    background: var(--color-available-alt);
}

td.has-bad {
    background: var(--color-bad-summary);
    color: #7a2020;
}

td.has-unknown {
    background: var(--color-unknown-summary);
    color: #6a5010;
}

tr:first-child th {
    position: sticky;
    top: 0;
    z-index: 80;
    background: var(--color-white);
    color: var(--color-text);
    font-weight: 600;
    box-shadow: 0 1px 0 var(--color-border);
}

th:first-child, td:first-child {
    background: var(--color-time-col);
    width: 42px;
    color: var(--color-text-muted);
    font-size: 0.65rem;
}

tr:first-child th:first-child {
    background: var(--color-gray-header);
}

tr:first-child th:nth-child(2) {
    background: var(--color-header-Sunday);
    color: #8a3030;
}

tr:first-child th:last-child {
    background: var(--color-header-Saturday);
    color: #2a4a78;
}

button, table, th, td {
    user-select: none;
    -webkit-user-select: none;
}

/* ===== Popups ===== */
.popup {
    position: absolute;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    font-size: 0.8rem;
    color: var(--color-text);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px var(--color-shadow-md);
    z-index: 200;
    max-width: min(90vw, 320px);
}

.popup h3 {
    margin-top: 0;
    font-size: 0.95rem;
}

.popup a {
    color: var(--color-primary);
    text-decoration: none;
}

.popup a:hover {
    text-decoration: underline;
}

/* ===== Help overlay ===== */
#helpOverlay {
    position: fixed;
    inset: 0;
    background: var(--color-overlay-bg);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

#helpContent {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    max-width: 520px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 8px 32px var(--color-shadow-md);
    color: var(--color-text);
}

#helpContent h2,
#helpContent h3 {
    color: var(--color-text);
}

#helpContent ul {
    padding-left: 1.25rem;
}

#helpContent ul li {
    margin-top: var(--spacing-md);
    line-height: 1.65;
    color: var(--color-text-muted);
}

#closeHelp {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 0.35rem 0.75rem;
    background: var(--color-surface-muted);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 0.8125rem;
}

/* ===== FAB (summary only) ===== */
body.has-fab .back-to-home-btn {
    position: fixed;
    bottom: max(12px, env(safe-area-inset-bottom, 12px));
    left: max(12px, env(safe-area-inset-left, 12px));
    z-index: 95;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1rem;
    border-radius: var(--radius-full);
    background: var(--color-white);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    box-shadow: 0 2px 8px var(--color-shadow-md);
}

body.has-fab .back-to-home-btn:hover {
    background: var(--color-surface-muted);
    color: var(--color-primary);
}

/* ===== Responsive ===== */
@media screen and (max-width: 700px) {
    .headerTop {
        row-gap: var(--spacing-xs);
    }

    .share-buttons-container {
        margin-left: 0;
        width: 100%;
        justify-content: flex-end;
    }
}

@media screen and (max-width: 600px) {
    :root {
        --fab-offset: 48px;
    }

    .header .button-container .submit-btn {
        flex: 1 1 100%;
        text-align: center;
        order: 10;
    }

    .header .button-container .edit-slots-btn {
        flex: 1 1 100%;
        margin-left: 0 !important;
        text-align: center;
    }

    th, td {
        height: 26px;
        font-size: 0.65rem;
    }

    body.has-fab .back-to-home-btn {
        padding: 0.45rem 0.8rem;
        font-size: 0.75rem;
    }
}

@media screen and (max-width: 400px) {
    .header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .header .button-container {
        gap: var(--spacing-xs);
    }
}