:root {
    --bg: #f4f4f5;
    --fg: #18181b;
    --card-bg: #ffffff;
    --border: #d4d4d8;
    --accent: #2563eb;
    --accent-fg: #ffffff;
    --success-bg: #16a34a;
    --error-bg: #dc2626;
    --feedback-fg: #ffffff;
}

:root[data-theme="dark"] {
    --bg: #18181b;
    --fg: #f4f4f5;
    --card-bg: #27272a;
    --border: #3f3f46;
    --accent: #3b82f6;
    --accent-fg: #ffffff;
    --success-bg: #15803d;
    --error-bg: #b91c1c;
    --feedback-fg: #ffffff;
}

* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, sans-serif;
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    min-height: 100vh;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--border);
    gap: 1rem;
    flex-wrap: wrap;
}

main {
    padding: 1.5rem;
    max-width: 960px;
    margin: 0 auto;
}

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

input[type="text"], input[type="password"], input[type="email"], input[type="number"], select {
    font-size: 1.25rem;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    background: var(--card-bg);
    color: var(--fg);
    width: 100%;
    max-width: 480px;
}

button, .btn {
    font-size: 1.1rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: 2px solid var(--border);
    background: var(--card-bg);
    color: var(--fg);
    cursor: pointer;
}

button.primary {
    background: var(--accent);
    color: var(--accent-fg);
    border-color: var(--accent);
}

/* Depo eldiveniyle kullanılabilecek büyüklükte dokunma alanları. */
.big-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 9rem;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    border-radius: 1rem;
    border: 3px solid var(--accent);
    background: var(--card-bg);
    color: var(--fg);
}

.big-btn:active {
    background: var(--accent);
    color: var(--accent-fg);
}

.secondary-actions {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
}

.secondary-actions .btn {
    display: block;
    text-align: center;
    text-decoration: none;
}

/* Üst bar: solda "Ana menü", yanında menü simgesi. Her sayfada aynı. */
header.topbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: nowrap;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--card-bg);
}

.topbar .home-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 44px;
    padding: 0.4rem 0.85rem 0.4rem 0.6rem;
    border-radius: 0.6rem;
    border: 1px solid var(--border);
    color: var(--fg);
    font-weight: 700;
    text-decoration: none;
}

.topbar .home-btn svg, .topbar .menu-toggle svg {
    width: 22px;
    height: 22px;
}

.menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 0.6rem;
    background: transparent;
    color: var(--fg);
}

.header-greeting {
    flex: 1;
    text-align: right;
    font-size: 0.9rem;
    opacity: 0.75;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Ana Menü / Çıkış gibi genel gezinme — soldan açılan sabit panel. */
.app-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 240px;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    box-shadow: 4px 0 16px rgba(0, 0, 0, 0.15);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    z-index: 1100;
}

.app-sidebar.open {
    transform: translateX(0);
}

.app-sidebar .sidebar-link {
    display: block;
    width: 100%;
    text-align: left;
    font-size: 1.1rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: none;
    background: transparent;
    color: var(--fg);
    text-decoration: none;
    cursor: pointer;
}

.app-sidebar .sidebar-link:hover {
    background: var(--bg);
}

.app-sidebar .sidebar-link.sidebar-sub { padding-left: 2.2rem; font-size: .92em; }
.app-sidebar .sidebar-link.active {
    background: var(--accent);
    color: var(--accent-fg);
    font-weight: 700;
}

.app-sidebar {
    overflow-y: auto;
    gap: 0.25rem;
    padding: 1rem 0.75rem calc(1rem + env(safe-area-inset-bottom, 0px));
    width: 270px;
}

.app-sidebar .sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 800;
    font-size: 1.1rem;
    padding: 0 0.25rem 0.5rem 1rem;
}

.app-sidebar .sidebar-close {
    width: 40px;
    height: 40px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--fg);
    font-size: 1.1rem;
}

.app-sidebar .sidebar-section {
    margin: 0.75rem 1rem 0.25rem;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.6;
}

.app-sidebar .sidebar-bottom {
    margin-top: auto;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.app-sidebar .sidebar-logout {
    color: var(--error-bg);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 1050;
}

.sidebar-overlay.open {
    display: block;
}

/* Her işlem sonrası tam ekran renkli geri bildirim: yeşil = başarılı, kırmızı = hata. */
.feedback-screen {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    padding: 2rem;
    text-align: center;
    color: var(--feedback-fg);
    z-index: 1000;
}

/* Sayfa içinde hazır bekleyen bitiş ekranı: hidden özniteliği display:flex'i ezsin. */
.feedback-screen[hidden] {
    display: none !important;
}

.feedback-screen.success {
    background: var(--success-bg);
}

.feedback-screen.error {
    background: var(--error-bg);
}

.feedback-screen .message {
    font-size: 2rem;
    font-weight: 700;
}

.feedback-screen .detail {
    font-size: 1.25rem;
}

.feedback-screen .btn {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.6);
    color: var(--feedback-fg);
}

.basket-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.basket-list li {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    background: var(--card-bg);
}

/* Kurulumcu ekranı — mobil öncelikli kart listesi. */
section.panel {
    margin-bottom: 2rem;
}

section.panel h2 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--fg);
    opacity: 0.7;
    margin-bottom: 0.75rem;
}

details.panel summary {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--fg);
    opacity: 0.7;
    margin-bottom: 0.75rem;
    cursor: pointer;
}

.subsection-label {
    font-size: 0.95rem;
    font-weight: 700;
    margin: 1.25rem 0 0.5rem;
    opacity: 0.85;
}

.subsection-label:first-of-type {
    margin-top: 0;
}

.item-card-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.item-card {
    display: block;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    background: var(--card-bg);
    color: var(--fg);
    text-decoration: none;
    min-height: 2.75rem;
}

.item-card .title {
    font-size: 1.1rem;
    font-weight: 600;
}

.item-card .subtitle {
    opacity: 0.75;
    font-size: 0.95rem;
}

.item-card.actionable:active {
    background: var(--accent);
    color: var(--accent-fg);
}

.empty-hint {
    opacity: 0.6;
    font-style: italic;
}

.scan-btn {
    display: block;
    width: 100%;
    margin-bottom: 1.5rem;
    padding: 1rem;
    font-size: 1.1rem;
}

#qr-reader {
    max-width: 480px;
    margin: 0 auto 1rem;
}

/* Admin ekranları: masaüstü öncelikli, tablo/form ağırlıklı. */
main.wide {
    max-width: 1200px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

.data-table th, .data-table td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    font-size: 0.85rem;
    text-transform: uppercase;
    opacity: 0.7;
}

.data-table td select, .data-table td input {
    font-size: 1rem;
    padding: 0.35rem 0.5rem;
    width: auto;
}

.data-table .row-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.inline-form {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.inline-form > div {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.inline-form label {
    font-size: 0.85rem;
    opacity: 0.75;
}

.inline-form input, .inline-form select {
    width: auto;
    min-width: 160px;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.8rem;
    border: 1px solid var(--border);
}

.badge.on {
    background: var(--success-bg);
    color: var(--feedback-fg);
    border-color: var(--success-bg);
}

.badge.off {
    background: var(--error-bg);
    color: var(--feedback-fg);
    border-color: var(--error-bg);
}

.admin-menu {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1rem;
}

.admin-menu a {
    display: block;
    padding: 1.25rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    background: var(--card-bg);
    text-decoration: none;
    color: var(--fg);
    font-weight: 600;
}

.admin-menu a:active {
    background: var(--accent);
    color: var(--accent-fg);
}