:root {
    --primary-color: #4a6fa5;
    --secondary-color: #166088;
    --accent-color: #4fc3f7;
    --success-color: #4caf50;
    --danger-color: #f44336;
    --warning-color: #f59e0b;
    --background-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-color: #333;
    --footer-color: #777777;
    --toggle-bg: #e0e0e0;
    --hover-background: rgba(79, 195, 247, 0.1);
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --link-color: #5d8ac7;
    --border-color: #e0e0e0;
    --medium-gray: #9e9e9e;
}

[data-theme="dark"] {
    --primary-color: #5d8ac7;
    --secondary-color: #2c7cb0;
    --accent-color: #64d8ff;
    --background-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --footer-color: #777777;
    --toggle-bg: #333333;
    --border-color: #333333;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }

body { background-color: var(--background-color); color: var(--text-color); line-height: 1.6; transition: background-color 0.3s ease, color 0.3s ease; }

.container { max-width: 1100px; margin: 0 auto; padding: 2rem; }

header { position: relative; text-align: center; margin-bottom: 2rem; }
h1 { font-size: 2.1rem; margin-bottom: .25rem; color: var(--primary-color); }
header p { color: var(--medium-gray); }

#theme-toggle { position: absolute; top: 0; right: 0; margin: 1rem; }

.theme-toggle-btn {
    background: none; border: none; color: var(--primary-color);
    cursor: pointer; width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    transition: background-color 0.3s ease; padding: 8px;
}
.theme-toggle-btn:hover { background-color: var(--toggle-bg); }

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.toolbar {
    display: flex; justify-content: space-between; align-items: center;
    gap: 1rem; margin-bottom: 1rem; flex-wrap: wrap;
}

.btn {
    display: inline-block; padding: .55rem .9rem;
    border-radius: 8px; border: 1px solid var(--border-color);
    text-decoration: none; color: var(--text-color); background: transparent;
    cursor: pointer; font-size: 1rem; line-height: 1.2; font-weight: 500;
    transition: opacity .2s ease, background-color .2s ease;
    font-family: inherit;
}
.btn:hover { opacity: .9; }
.btn.primary { background: var(--primary-color); border-color: var(--primary-color); color: #fff; }
.btn.danger { border-color: var(--danger-color); color: var(--danger-color); }
.btn.danger:hover { background: var(--danger-color); color: #fff; opacity: 1; }

table { width: 100%; border-collapse: collapse; }
th, td { padding: .6rem; border-bottom: 1px solid var(--border-color); text-align: left; vertical-align: top; }
th { color: var(--medium-gray); font-weight: 600; }

.badge {
    display: inline-block; padding: .2rem .6rem;
    border-radius: 999px; border: 1px solid var(--border-color);
    color: var(--medium-gray); font-size: .85rem;
}

.error-box {
    white-space: pre-wrap; border: 1px solid var(--border-color);
    border-radius: 8px; padding: 1rem; margin-bottom: 1rem;
    background: rgba(244, 67, 54, 0.08); color: var(--danger-color);
}
.success-box {
    border: 1px solid var(--border-color); border-radius: 8px;
    padding: 1rem; margin-bottom: 1rem;
    background: rgba(76, 175, 80, 0.08); color: var(--success-color);
}

label { display: block; margin: .9rem 0 .35rem 0; color: var(--medium-gray); font-weight: 600; }
input, textarea, select {
    width: 100%; padding: .65rem; border-radius: 8px;
    border: 1px solid var(--border-color);
    background: transparent; color: var(--text-color);
    font-family: inherit; font-size: 1rem;
}
textarea { min-height: 100px; resize: vertical; }

.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; margin-bottom: 1rem; color: var(--medium-gray); font-size: .9rem; }
.breadcrumb a { color: var(--link-color); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

.folder-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.folder-card {
    background: var(--card-bg); border-radius: 10px; padding: 1rem;
    border: 1px solid var(--border-color); box-shadow: var(--box-shadow);
    text-decoration: none; color: var(--text-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex; flex-direction: column; gap: 4px;
}
.folder-card:hover { transform: translateY(-4px); box-shadow: 0 8px 16px rgba(0,0,0,.15); }
.folder-card .icon { font-size: 2rem; }
.folder-card .name { font-weight: 600; }
.folder-card .desc { font-size: .85rem; color: var(--medium-gray); }

.admin-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .5rem 0; border-bottom: 1px solid var(--border-color); }
.admin-row:last-child { border-bottom: none; }
.admin-row a { color: var(--text-color); text-decoration: none; display: flex; align-items: center; gap: .5rem; flex: 1; font-weight: 500; }
.admin-row a:hover { color: var(--primary-color); }

.file-input-wrap { position: relative; margin-bottom: .75rem; }
.file-input-wrap input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.file-drop {
    border: 2px dashed var(--border-color); border-radius: 8px;
    padding: 2rem; text-align: center; cursor: pointer;
    transition: border-color .2s;
}
.file-drop:hover { border-color: var(--accent-color); }
.file-drop .icon { font-size: 2rem; color: var(--primary-color); margin-bottom: .5rem; }
.file-drop p { color: var(--medium-gray); }

#file-preview { margin: .5rem 0; font-size: .9rem; color: var(--medium-gray); }
#file-preview span { display: block; }

.progress-wrap { margin: .75rem 0; display: none; }
.progress-wrap progress { width: 100%; height: 8px; border-radius: 4px; }

.qr-wrap { text-align: center; margin: 1rem 0; }
.secret-code {
    background: var(--toggle-bg); border-radius: 8px; padding: .65rem 1rem;
    font-family: monospace; word-break: break-all; font-size: .9rem; margin: .5rem 0;
}

a { color: var(--link-color); text-decoration: none; transition: opacity .2s ease; }

footer { text-align: center; margin-top: 2rem; color: var(--footer-color); font-size: .9rem; }