:root {
    --bg: #f5f7fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #111827;
    --primary-text: #ffffff;
    --secondary: #eef2f7;
    --success-bg: #ecfdf3;
    --success-text: #166534;
    --error-bg: #fef2f2;
    --error-text: #991b1b;
    --radius: 16px;
    --shadow: 0 10px 30px rgba(17, 24, 39, 0.08);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

body {
    min-height: 100vh;
}

.app-shell {
    min-height: 100vh;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 18px 16px;
    border-bottom: 1px solid var(--border);
    background: #fff;
    position: sticky;
    top: 0;
    z-index: 10;
}

.brand {
    font-size: 1.1rem;
    font-weight: 700;
}

.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px;
}

.auth-wrap {
    min-height: calc(100vh - 120px);
    display: grid;
    place-items: center;
}

.auth-card {
    width: 100%;
    max-width: 420px;
}

h1, h2, h3, p {
    margin-top: 0;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 6px;
}

h2 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.subtle {
    color: var(--muted);
    margin: 0;
    line-height: 1.5;
}

.stack-lg > * + * {
    margin-top: 20px;
}

.stack-md > * + * {
    margin-top: 14px;
}

.field {
    display: grid;
    gap: 8px;
}

.field span {
    font-weight: 600;
}

input[type="email"],
input[type="password"],
input[type="file"] {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 13px 14px;
    font-size: 1rem;
    background: #fff;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 0;
    border-radius: 12px;
    padding: 12px 16px;
    font-weight: 700;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: var(--primary-text);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--text);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 14px 16px;
    border-radius: 14px;
    border: 1px solid transparent;
    line-height: 1.5;
}

.alert-success {
    background: var(--success-bg);
    color: var(--success-text);
    border-color: #bbf7d0;
}

.alert-error {
    background: var(--error-bg);
    color: var(--error-text);
    border-color: #fecaca;
}

.day-grid {
    display: grid;
    gap: 14px;
}

.day-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.day-card:hover {
    transform: translateY(-2px);
}

.pill {
    background: var(--secondary);
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 0.9rem;
    font-weight: 700;
}

.page-head,
.section-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 14px;
    flex-wrap: wrap;
}

.text-link {
    color: #2563eb;
    font-weight: 600;
}

.upload-box {
    display: grid;
    gap: 10px;
    padding: 16px;
    border: 1px dashed #cbd5e1;
    border-radius: 14px;
    background: #f8fafc;
}

.simple-list {
    margin: 8px 0 0 18px;
    padding: 0;
}

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.thumb-card {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
}

.thumb-card img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    background: #f3f4f6;
}

.thumb-meta {
    display: grid;
    gap: 4px;
    padding: 12px;
    font-size: 0.92rem;
}

.gallery-list {
    display: grid;
    gap: 16px;
}

.gallery-card {
    display: grid;
    gap: 14px;
}

.gallery-image {
    width: 100%;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: #f3f4f6;
    object-fit: contain;
    max-height: 360px;
}

.gallery-info {
    display: grid;
    gap: 12px;
}

.button-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

@media (min-width: 700px) {
    .container {
        padding: 28px 24px 56px;
    }

    .day-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .thumb-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .gallery-card {
        grid-template-columns: 260px 1fr;
        align-items: center;
    }
}