/**
 * GK Billing — home teal design system
 */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@500;600;700;800&family=Inter:wght@400;500;600;700&display=swap');

:root {
    --gk-primary: #0d7377;
    --gk-primary-light: #14a098;
    --gk-primary-dark: #074f51;
    --gk-accent: #f59e0b;
    --gk-success: #10b981;
    --gk-danger: #ef4444;
    --gk-bg: #f8fafc;
    --gk-card: #ffffff;
    --gk-text: #0f172a;
    --gk-muted: #64748b;
    --gk-border: #e2e8f0;
    --gk-shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
    --gk-shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.03);
    --gk-shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
    --gk-radius: 14px;
    --gk-radius-lg: 18px;
    --gk-font-display: 'Plus Jakarta Sans', system-ui, sans-serif;
    --gk-font-body: 'Inter', system-ui, sans-serif;
}

html {
    height: 100%;
}

body {
    min-height: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.gk-page {
    font-family: var(--gk-font-body);
    background: var(--gk-bg);
    color: var(--gk-text);
    flex: 1 0 auto;
    display: flex;
    flex-direction: column;
}

.gk-page > .gk-section {
    flex: 1 0 auto;
}

footer.bg-dark {
    margin-top: auto;
    flex-shrink: 0;
}

.gk-page .main-content {
    margin-left: 0 !important;
    padding: 0 !important;
}

.gk-hero {
    background: linear-gradient(135deg, var(--gk-primary) 0%, var(--gk-primary-dark) 100%);
    padding: 48px 0 56px;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.gk-hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -12%;
    width: 48%;
    height: 180%;
    background: rgba(255, 255, 255, 0.04);
    transform: rotate(18deg);
    pointer-events: none;
}

.gk-hero .container {
    position: relative;
    z-index: 1;
}

.gk-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0 0 18px;
    font-size: 0.85rem;
}

.gk-breadcrumb a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
}

.gk-breadcrumb a:hover { color: #fff; }
.gk-breadcrumb span { color: rgba(255, 255, 255, 0.45); }
.gk-breadcrumb .current { color: rgba(255, 255, 255, 0.95); }

.gk-hero-row {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.gk-hero-logo {
    width: 88px;
    height: 88px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: var(--gk-shadow-md);
}

.gk-hero-logo img {
    width: 78%;
    height: 78%;
    object-fit: contain;
}

.gk-hero-title {
    font-family: var(--gk-font-display);
    font-size: clamp(1.75rem, 4vw, 2.4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin: 0 0 8px;
    line-height: 1.2;
    color: #fff;
}

.gk-hero-sub {
    margin: 0 0 14px;
    max-width: none;
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.05rem;
    line-height: 1.45;
    white-space: nowrap;
}

.gk-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.gk-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.18);
    font-size: 0.82rem;
    font-weight: 600;
}

.gk-section {
    padding: 32px 0 96px;
}

.gk-search {
    background: var(--gk-card);
    border: 1px solid var(--gk-border);
    border-radius: var(--gk-radius-lg);
    box-shadow: var(--gk-shadow-md);
    padding: 24px;
    max-width: 720px;
    margin: -8px auto 28px;
    position: relative;
    z-index: 2;
}

.gk-search h2 {
    font-family: var(--gk-font-display);
    font-size: 1.15rem;
    font-weight: 800;
    margin: 0 0 16px;
}

.gk-search p {
    margin: 0 0 16px;
    color: var(--gk-muted);
    font-size: 0.92rem;
}

.gk-search-row {
    display: flex;
    gap: 10px;
}

.gk-input {
    flex: 1;
    min-width: 0;
    border: 1px solid var(--gk-border);
    border-radius: 12px;
    padding: 13px 16px;
    font-size: 1rem;
    background: var(--gk-bg);
    color: var(--gk-text);
}

.gk-input:focus {
    outline: none;
    border-color: var(--gk-primary-light);
    box-shadow: 0 0 0 3px rgba(13, 115, 119, 0.15);
    background: #fff;
}

.gk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 20px;
    border-radius: 12px;
    border: 1px solid transparent;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s ease, transform 0.2s ease;
}

.gk-btn-primary {
    background: var(--gk-primary);
    color: #fff;
}

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

.gk-btn-download {
    background: var(--gk-success);
    color: #fff;
}

.gk-btn-download:hover {
    background: #059669;
    color: #fff;
}

.gk-loader {
    text-align: center;
    padding: 40px 16px;
}

.gk-spinner {
    width: 42px;
    height: 42px;
    border: 3px solid rgba(13, 115, 119, 0.15);
    border-top-color: var(--gk-primary);
    border-radius: 50%;
    animation: gk-spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

@keyframes gk-spin { to { transform: rotate(360deg); } }

.gk-loader p {
    color: var(--gk-muted);
    margin: 0;
}

.gk-results {
    max-width: 1040px;
    margin: 0 auto;
}

.gk-download-bar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 16px;
}

.gk-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.gk-stat {
    background: var(--gk-card);
    border: 1px solid var(--gk-border);
    border-radius: var(--gk-radius);
    box-shadow: var(--gk-shadow-sm);
    padding: 18px;
    display: flex;
    gap: 14px;
    align-items: center;
}

.gk-stat-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.gk-stat-paid .gk-stat-icon { background: rgba(16, 185, 129, 0.12); color: var(--gk-success); }
.gk-stat-due .gk-stat-icon { background: rgba(245, 158, 11, 0.14); color: var(--gk-accent); }
.gk-stat-now .gk-stat-icon { background: rgba(13, 115, 119, 0.12); color: var(--gk-primary); }

.gk-stat-value {
    font-family: var(--gk-font-display);
    font-weight: 800;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.gk-stat-paid .gk-stat-value { color: var(--gk-success); }
.gk-stat-due .gk-stat-value { color: var(--gk-accent); }
.gk-stat-now .gk-stat-value { color: var(--gk-primary); }

.gk-stat-label {
    font-size: 0.82rem;
    color: var(--gk-muted);
}

.gk-panel {
    background: var(--gk-card);
    border: 1px solid var(--gk-border);
    border-radius: var(--gk-radius-lg);
    box-shadow: var(--gk-shadow-sm);
    padding: 20px 22px;
    margin-bottom: 16px;
}

.gk-panel h3 {
    font-family: var(--gk-font-display);
    font-size: 1.05rem;
    font-weight: 800;
    margin: 0 0 16px;
}

.gk-info-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.gk-info {
    background: var(--gk-bg);
    border: 1px solid var(--gk-border);
    border-radius: 12px;
    padding: 12px 14px;
    border-left: 3px solid var(--gk-primary);
}

.gk-info dt {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--gk-muted);
    font-weight: 700;
    margin: 0 0 4px;
}

.gk-info dd {
    margin: 0;
    font-weight: 700;
    font-size: 0.98rem;
}

.gk-bills {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.gk-bill {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    background: var(--gk-bg);
    border: 1px solid var(--gk-border);
    border-radius: 12px;
    padding: 12px 14px;
}

.gk-bill.paid { border-left: 4px solid var(--gk-success); }
.gk-bill.unpaid { border-left: 4px solid var(--gk-danger); }
.gk-bill.current {
    background: linear-gradient(135deg, var(--gk-primary) 0%, var(--gk-primary-dark) 100%);
    color: #fff;
    border-color: transparent;
}

.gk-bill-left {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-shrink: 0;
    min-width: 148px;
}

.gk-bill-icon {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(13, 115, 119, 0.1);
    color: var(--gk-primary);
}

.gk-bill.paid .gk-bill-icon { background: rgba(16, 185, 129, 0.12); color: var(--gk-success); }
.gk-bill.unpaid .gk-bill-icon { background: rgba(239, 68, 68, 0.12); color: var(--gk-danger); }
.gk-bill.current .gk-bill-icon { background: rgba(255, 255, 255, 0.18); color: #fff; }

.gk-bill-month { font-weight: 700; font-size: 0.95rem; }
.gk-bill-status { font-size: 0.75rem; color: var(--gk-muted); }
.gk-bill.current .gk-bill-status { color: rgba(255, 255, 255, 0.75); }
.gk-bill-amount {
    font-family: var(--gk-font-display);
    font-weight: 800;
    flex-shrink: 0;
    margin-left: auto;
    text-align: right;
}
.gk-bill.paid .gk-bill-amount { color: var(--gk-success); }
.gk-bill.unpaid .gk-bill-amount { color: var(--gk-danger); }

.gk-notes {
    flex: 1;
    min-width: 0;
    font-size: 0.8rem;
    color: #64748b;
    line-height: 1.35;
}

.gk-bill.current .gk-notes {
    color: rgba(255, 255, 255, 0.85);
}

.gk-empty,
.gk-alert {
    max-width: 720px;
    margin: 0 auto 16px;
    background: var(--gk-card);
    border: 1px solid var(--gk-border);
    border-radius: var(--gk-radius-lg);
    padding: 28px 22px;
    text-align: center;
    color: var(--gk-muted);
}

.gk-empty i { font-size: 1.8rem; color: var(--gk-primary-light); margin-bottom: 8px; }
.gk-empty h3 { font-family: var(--gk-font-display); color: var(--gk-text); margin: 0 0 6px; }
.gk-alert { border-color: #fecaca; background: #fef2f2; color: #991b1b; text-align: left; }

@media (max-width: 900px) {
    .gk-stats,
    .gk-info-grid { grid-template-columns: 1fr; }
    .gk-hero-sub { white-space: normal; }
}

@media (max-width: 640px) {
    .gk-search-row { flex-direction: column; }
    .gk-btn { width: 100%; }
    .gk-download-bar { justify-content: stretch; }
    .gk-download-bar .gk-btn { width: 100%; }
    .gk-bill { flex-wrap: wrap; }
    .gk-notes { flex: 1 1 100%; order: 3; }
}