/* Design tokens — light by default, dark via prefers-color-scheme */
:root {
    color-scheme: light dark;
    --bg: #f2f2f7;
    --surface: #ffffff;
    --border: #e3e3e8;
    --text: #1d1d1f;
    --text-secondary: #6e6e73;
    --primary: #0071e3;
    --primary-hover: #0077ed;
    --focus-ring: rgba(0, 113, 227, .18);
    --toolbar-bg: rgba(242, 242, 247, .82);
    --danger: #d70015;
    --danger-bg-hover: rgba(215, 0, 21, .08);
    --success: #1a7f37;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 7px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .06), 0 1px 1px rgba(0, 0, 0, .04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, .08), 0 1px 3px rgba(0, 0, 0, .06);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, .12), 0 2px 8px rgba(0, 0, 0, .06);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #000000;
        --surface: #1c1c1e;
        --border: #3a3a3c;
        --text: #f5f5f7;
        --text-secondary: #98989d;
        --primary: #0a84ff;
        --primary-hover: #409cff;
        --focus-ring: rgba(10, 132, 255, .25);
        --toolbar-bg: rgba(0, 0, 0, .72);
        --danger: #ff453a;
        --danger-bg-hover: rgba(255, 69, 58, .12);
        --success: #32d74b;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, .5);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, .55);
        --shadow-lg: 0 12px 32px rgba(0, 0, 0, .6);
    }
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 .35rem;
    letter-spacing: -.01em;
}

.subtitle {
    margin: 0 0 1.5rem;
    color: var(--text-secondary);
    font-size: .9rem;
}

/* Brand mark, reused in auth cards and the toolbar */
.brand {
    display: flex;
    align-items: center;
    gap: .5rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}
.brand-mark { color: var(--primary); flex-shrink: 0; }
.brand-name {
    font-size: .8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
}

/* Auth cards (sign in / reset / change password) */
.auth-card {
    max-width: 380px;
    margin: 10vh auto 2rem;
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.25rem 2rem;
}

@media (max-width: 480px) {
    .auth-card { margin: 5vh 1rem 2rem; padding: 1.75rem 1.5rem; }
}

.field {
    display: flex;
    flex-direction: column;
    gap: .4rem;
    margin-bottom: 1.1rem;
}

.field label {
    font-size: .82rem;
    font-weight: 600;
    color: var(--text-secondary);
}

input[type="text"], input[type="password"] {
    font: inherit;
    font-size: 1rem;
    padding: .7rem .8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    width: 100%;
    transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}

input[type="text"]:focus, input[type="password"]:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 4px var(--focus-ring);
}

.auth-footer {
    text-align: center;
    margin: 1.25rem 0 0;
    font-size: .88rem;
}

.auth-footer a { color: var(--primary); text-decoration: none; }
.auth-footer a:hover { text-decoration: underline; }

/* Buttons */
.btn {
    font: inherit;
    font-size: .95rem;
    font-weight: 600;
    padding: .7rem 1.3rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: background .15s ease, border-color .15s ease, transform .05s ease, color .15s ease;
}
.btn:active { transform: scale(.97); }

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

.btn-secondary { background: transparent; border-color: var(--border); color: var(--text); }
.btn-secondary:hover { background: var(--bg); }

.btn-danger { background: transparent; border-color: var(--border); color: var(--danger); }
.btn-danger:hover { background: var(--danger-bg-hover); border-color: var(--danger); }

.btn-block { width: 100%; }
.btn-sm { padding: .45rem .9rem; font-size: .85rem; }

.btn-row { display: flex; gap: .6rem; }
.btn-row .btn { flex: 1; }

/* Manage view */
.manage-shell {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 1.5rem 3rem;
}

#toolbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1.25rem 0 1rem;
    margin-bottom: .5rem;
    background: var(--toolbar-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
#toolbar .brand { margin-bottom: 0; }
#toolbar .brand-name {
    font-size: 1.1rem;
    text-transform: none;
    letter-spacing: normal;
    font-weight: 700;
    color: var(--text);
}

.toolbar-actions { display: flex; gap: .6rem; flex-wrap: wrap; }

#gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.photo-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform .15s ease, box-shadow .15s ease;
}
.photo-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.photo-card img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    display: block;
    background: var(--bg);
}

/* Delete: an icon button overlaid on the photo (always visible, not just on
   hover, so it works on touch devices too). */
.delete-btn {
    position: absolute;
    top: .5rem;
    right: .5rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, .55);
    color: #fff;
    cursor: pointer;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, .3);
    transition: background .15s ease, transform .1s ease;
}
.delete-btn:hover { background: var(--danger); transform: scale(1.08); }
.delete-btn:active { transform: scale(.95); }

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 1.5rem;
    color: var(--text-secondary);
    border: 1.5px dashed var(--border);
    border-radius: var(--radius-lg);
}
.empty-state p:first-child { font-weight: 600; color: var(--text); margin: 0 0 .35rem; }
.empty-state .empty-hint { margin: 0; font-size: .9rem; }

/* Status toast — a single element shared by every view, floating at the
   bottom so it never disturbs form layout. :not(:empty) shows it only
   when setStatus() has put text in it. */
#status {
    position: fixed;
    left: 50%;
    bottom: 1.5rem;
    transform: translateX(-50%);
    background: var(--surface);
    border: 1px solid var(--border);
    padding: .65rem 1.1rem;
    border-radius: 999px;
    box-shadow: var(--shadow-md);
    font-size: .88rem;
    font-weight: 500;
    color: var(--danger);
    opacity: 0;
    pointer-events: none;
    max-width: 90vw;
    text-align: center;
    z-index: 100;
    transition: opacity .2s ease;
}
#status:not(:empty) { opacity: 1; }
#status.ok { color: var(--success); }