/* SOLA SWIMMING ACADEMY — 品牌样式（与 solaswimming.com 一致） */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;600;700&display=swap');

:root {
    --sola-primary: #2E86C1;
    --sola-primary-dark: #1a6d99;
    --sola-primary-light: rgba(46, 134, 193, 0.12);
    --sola-secondary: #F7B731;
    --sola-secondary-dark: #e0a320;
    --sola-bg: #F4F6F9;
    --sola-card-shadow: 0 4px 20px rgba(46, 134, 193, 0.1);
    --sola-shadow-hover: 0 12px 40px rgba(46, 134, 193, 0.16);
    --sola-radius: 16px;
    --sola-radius-sm: 10px;
    --sola-text: #1F2A38;
    --sola-text-muted: #5a6c7d;
    --sola-font: 'Inter', 'Noto Sans TC', system-ui, sans-serif;
    --sola-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --sola-glass: rgba(255, 255, 255, 0.92);
}

body.sola-body {
    background: var(--sola-bg);
    background-image:
        radial-gradient(ellipse at 0% 0%, rgba(46, 134, 193, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 100% 100%, rgba(247, 183, 49, 0.05) 0%, transparent 45%);
    color: var(--sola-text);
    min-height: 100vh;
    font-family: var(--sola-font);
    -webkit-font-smoothing: antialiased;
}

.sola-navbar {
    background: var(--sola-glass) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(46, 134, 193, 0.08), 0 4px 24px rgba(31, 42, 56, 0.04);
    border-bottom: 1px solid rgba(46, 134, 193, 0.06);
}

.sola-navbar .nav-link {
    font-weight: 500;
    border-radius: 999px;
    padding: 0.4rem 0.85rem !important;
    transition: var(--sola-transition);
}

.sola-navbar .nav-link:hover {
    background: var(--sola-primary-light);
    color: var(--sola-primary-dark) !important;
}

.sola-navbar .nav-link.active {
    background: var(--sola-primary);
    color: #fff !important;
    font-weight: 600;
}

.sola-logo {
    height: 44px;
    width: auto;
    object-fit: contain;
    background: transparent;
}

.sola-logo-sm {
    height: 36px;
}

.sola-brand-text {
    color: var(--sola-primary);
    font-weight: 700;
    font-size: 1.05rem;
}

.sola-card {
    background: #fff;
    border: 1px solid rgba(46, 134, 193, 0.06);
    border-radius: var(--sola-radius);
    box-shadow: var(--sola-card-shadow);
    transition: var(--sola-transition);
}

.sola-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--sola-shadow-hover);
}

.sola-card--flat:hover {
    transform: none;
    box-shadow: var(--sola-card-shadow);
}

.sola-btn-primary {
    background: var(--sola-primary);
    border-color: var(--sola-primary);
    color: #fff;
    border-radius: 30px;
    font-weight: 600;
    padding: 0.45rem 1.25rem;
}

.sola-btn-primary:hover,
.sola-btn-primary:focus {
    background: var(--sola-primary-dark);
    border-color: var(--sola-primary-dark);
    color: #fff;
}

.btn-sola,
.sola-btn-sola {
    background-color: var(--sola-primary);
    color: #fff;
    border: none;
}

.btn-sola:hover,
.sola-btn-sola:hover {
    background-color: var(--sola-primary-dark);
    color: #fff;
}

.sola-link {
    color: var(--sola-primary);
    text-decoration: none;
}

.sola-link:hover {
    color: var(--sola-primary-dark);
}

.sola-accent {
    color: var(--sola-primary);
}

.sola-accent-border {
    border-color: var(--sola-primary) !important;
}

.sola-accent-bg {
    background: var(--sola-primary);
    color: #fff;
}

.sola-btn-outline {
    border-color: var(--sola-primary);
    color: var(--sola-primary);
    border-radius: 30px;
    font-weight: 600;
}

.sola-btn-outline:hover {
    background: var(--sola-primary);
    color: #fff;
}

.sola-heading {
    color: var(--sola-primary);
    font-weight: 700;
}

.sola-badge {
    background: var(--sola-primary-light);
    color: var(--sola-primary-dark);
    border-radius: 20px;
    font-weight: 500;
}

.sola-coach-avatar {
    width: 120px;
    height: 120px;
    object-fit: cover;
    border-radius: 50%;
    border: 3px solid var(--sola-primary);
}

.sola-admin-sidebar .nav-link {
    color: var(--sola-text);
    border-radius: 10px;
    margin-bottom: 0.25rem;
}

.sola-admin-sidebar .nav-link.active,
.sola-admin-sidebar .nav-link:hover {
    background: var(--sola-primary-light);
    color: var(--sola-primary-dark);
}

.sola-login-card {
    max-width: 420px;
    margin: 0 auto;
    border-radius: var(--sola-radius);
    box-shadow: var(--sola-card-shadow);
}

.sola-table thead {
    background: var(--sola-primary-light);
    color: var(--sola-primary-dark);
}

#fullcalendar .fc .fc-button-primary {
    background-color: var(--sola-primary);
    border-color: var(--sola-primary);
}

#fullcalendar .fc .fc-button-primary:hover,
#fullcalendar .fc .fc-button-primary:not(:disabled).fc-button-active {
    background-color: var(--sola-primary-dark);
    border-color: var(--sola-primary-dark);
}

#fullcalendar .fc .fc-toolbar-title {
    color: var(--sola-primary);
    font-weight: 700;
}

#fullcalendar .fc .fc-daygrid-day.fc-day-today {
    background-color: rgba(46, 134, 193, 0.1);
}

#fullcalendar .fc-event {
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.72rem;
    border: none;
    background-color: var(--sola-primary);
    border-color: var(--sola-primary);
}

/* 首頁 Hero */
.sola-hero {
    background: linear-gradient(135deg, #2E86C1 0%, #3498DB 55%, #1a6d99 100%);
    color: #fff;
    padding: 3.5rem 0 4rem;
    position: relative;
    overflow: hidden;
}

.sola-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.18) 0%, transparent 45%),
        radial-gradient(circle at 85% 80%, rgba(255, 255, 255, 0.12) 0%, transparent 40%);
    pointer-events: none;
}

.sola-hero-inner {
    position: relative;
    z-index: 1;
}

.sola-hero-logo {
    width: 88px;
    height: 88px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
}

.sola-hero-title {
    font-size: clamp(1.5rem, 4.5vw, 2.75rem);
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 1rem;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.sola-hero-divider {
    display: inline-block;
    margin: 0 0.5rem;
    opacity: 0.85;
    font-weight: 400;
}

.sola-hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    opacity: 0.95;
    margin-bottom: 2rem;
    max-width: 36rem;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.sola-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.sola-hero-btn {
    border-radius: 999px;
    font-weight: 700;
    padding: 0.65rem 1.75rem;
    min-width: 10rem;
}

.sola-hero-btn-primary {
    background: #fff;
    color: #2E86C1;
    border: 2px solid #fff;
}

.sola-hero-btn-primary:hover,
.sola-hero-btn-primary:focus {
    background: #fff8f0;
    color: #1a6d99;
    border-color: #fff8f0;
}

.sola-hero-btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.9);
}

.sola-hero-btn-outline:hover,
.sola-hero-btn-outline:focus {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-color: #fff;
}

@media (max-width: 768px) {
    .sola-logo { height: 36px; }
    .sola-hero {
        padding: 2.5rem 0 3rem;
    }
    .sola-hero-logo {
        width: 72px;
        height: 72px;
    }
    .sola-hero-divider {
        display: block;
        margin: 0.25rem 0;
        font-size: 1.25rem;
        line-height: 1;
    }
    .sola-hero-btn {
        width: 100%;
        max-width: 18rem;
    }
    #fullcalendar .fc-toolbar { flex-wrap: wrap; gap: 0.5rem; }
}

.sola-footer {
    background: #f8f9fa;
    border-top: 3px solid var(--sola-primary, #2E86C1);
}
.sola-footer a:hover {
    color: var(--sola-primary, #2E86C1) !important;
}

.sola-value-title {
    color: #2E86C1;
}
.sola-tagline {
    color: #2E86C1;
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.sola-mission-lead {
    max-width: 42rem;
    font-size: 1.125rem;
}
.letter-spacing-wide {
    letter-spacing: 0.12em;
}
.sola-value-card {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.sola-value-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0.5rem 1rem rgba(46, 134, 193, 0.12) !important;
}
.sola-founder-teaser {
    border-left: 4px solid #2E86C1;
}
.sola-about-accordion .accordion-button:not(.collapsed) {
    background-color: rgba(46, 134, 193, 0.08);
    color: #2E86C1;
}
.sola-about-accordion .accordion-button:focus {
    box-shadow: 0 0 0 0.2rem rgba(46, 134, 193, 0.25);
}

/* —— 使用说明书 /docs/ —— */
.sola-docs-page {
    max-width: 1400px;
    margin: 0 auto;
}

.sola-docs-layout {
    align-items: flex-start;
}

.sola-docs-toc {
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 6.5rem);
    overflow: hidden;
}

.sola-docs-toc-inner {
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 0.25rem;
    scrollbar-width: thin;
    scrollbar-color: rgba(46, 134, 193, 0.45) transparent;
}

.sola-docs-toc-inner::-webkit-scrollbar {
    width: 6px;
}

.sola-docs-toc-inner::-webkit-scrollbar-thumb {
    background: rgba(46, 134, 193, 0.45);
    border-radius: 3px;
}

.sola-docs-toc-group {
    margin-bottom: 0.75rem;
}

.sola-docs-toc-link {
    display: block;
    padding: 0.3rem 0.5rem;
    border-radius: 6px;
    color: var(--sola-text);
    text-decoration: none;
    font-size: 0.875rem;
    line-height: 1.35;
    border-left: 2px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.sola-docs-toc-link.toc-h2 {
    font-weight: 600;
    margin-top: 0.25rem;
    color: var(--sola-primary);
}

.sola-docs-toc-link.toc-h3 {
    padding-left: 1rem;
    font-size: 0.8125rem;
    color: #5a6c7d;
}

.sola-docs-toc-link:hover,
.sola-docs-toc-link.active {
    background: rgba(46, 134, 193, 0.1);
    color: var(--sola-primary-dark);
    border-left-color: var(--sola-primary);
}

.sola-docs-section-title {
    font-size: 1.35rem;
    color: var(--sola-primary);
    margin-bottom: 1rem;
    scroll-margin-top: 5.5rem;
}

.sola-docs-section {
    scroll-margin-top: 5.5rem;
}

.sola-docs-body h3 {
    font-size: 1.05rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--sola-text);
    scroll-margin-top: 5.5rem;
}

.sola-docs-body ol,
.sola-docs-body ul {
    padding-left: 1.35rem;
}

.sola-docs-body li {
    margin-bottom: 0.4rem;
}

.sola-docs-body p {
    margin-bottom: 0.75rem;
}

.sola-docs-changelog-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.sola-docs-changelog-item:last-child {
    border-bottom: none;
}

.sola-docs-faq .accordion-button:not(.collapsed) {
    background-color: rgba(46, 134, 193, 0.08);
    color: var(--sola-primary);
}

@media (max-width: 991.98px) {
    .sola-docs-toc {
        position: static;
        max-height: none;
    }

    .sola-docs-toc-inner {
        max-height: 14rem;
    }
}

/* —— Contextual help (? buttons & tooltips) —— */
.sola-help-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.35rem;
    height: 1.35rem;
    padding: 0;
    border: 1px solid rgba(46, 134, 193, 0.35);
    border-radius: 50%;
    background: rgba(46, 134, 193, 0.08);
    color: var(--sola-primary);
    font-size: 0.7rem;
    font-weight: 700;
    line-height: 1;
    cursor: pointer;
    flex-shrink: 0;
    transition: var(--sola-transition);
    vertical-align: middle;
}

.sola-help-btn:hover,
.sola-help-btn:focus {
    background: var(--sola-primary);
    border-color: var(--sola-primary);
    color: #fff;
    outline: none;
    box-shadow: 0 0 0 3px rgba(46, 134, 193, 0.25);
}

.sola-help-btn--xs {
    width: 1.15rem;
    height: 1.15rem;
    font-size: 0.62rem;
}

.sola-help-popover {
    max-width: 280px;
    font-size: 0.875rem;
    border: 1px solid rgba(46, 134, 193, 0.15);
    box-shadow: 0 8px 32px rgba(31, 42, 56, 0.12);
}

.sola-help-popover .popover-header {
    background: var(--sola-primary-light);
    color: var(--sola-primary-dark);
    font-weight: 600;
    border-bottom-color: rgba(46, 134, 193, 0.12);
}

/* —— Page section headers —— */
.sola-page-header {
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(46, 134, 193, 0.1);
}

.sola-page-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--sola-primary-dark);
    letter-spacing: -0.02em;
}

.sola-page-lead {
    font-size: 0.9rem;
    max-width: 42rem;
    line-height: 1.55;
}

/* —— Portal nav (member / coach) —— */
.portal-nav-link {
    border-radius: 999px !important;
    font-weight: 500;
    transition: var(--sola-transition);
}

.portal-nav-link.active {
    background: linear-gradient(135deg, var(--sola-primary) 0%, #3498db 100%) !important;
    color: #fff !important;
    box-shadow: 0 4px 14px rgba(46, 134, 193, 0.35);
}

.portal-nav-link:hover:not(.active) {
    background: var(--sola-primary-light) !important;
    color: var(--sola-primary-dark) !important;
}

.member-nav .nav-link,
.coach-nav .nav-link {
    color: var(--sola-text-muted);
}

.sola-admin-tip {
    background: linear-gradient(135deg, rgba(46, 134, 193, 0.08) 0%, rgba(247, 183, 49, 0.06) 100%);
    border: 1px solid rgba(46, 134, 193, 0.12);
    border-radius: var(--sola-radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--sola-text-muted);
}

.sola-form-label-with-help {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--sola-primary);
    box-shadow: 0 0 0 0.2rem rgba(46, 134, 193, 0.2);
}

.alert {
    border: none;
    border-radius: var(--sola-radius-sm);
}