/* =========================================================================
   I2DS Drive — design tokens
   ------------------------------------------------------------------------
   Brand palette per spec section 6:
       background: linear-gradient(#0f5b73 -> #1581a3)
       cards/buttons: #093442
       text on dark: #ffffff
       forms / tables: dark text on white background for readability
   ========================================================================= */

:root {
    --c-bg-from:   #0f5b73;
    --c-bg-to:     #1581a3;
    --c-surface:   #093442;        /* cards, buttons, navbar */
    --c-surface-2: #0c4357;        /* hover state */
    --c-accent:    #2dd4bf;        /* highlight (teal) */
    --c-accent-2:  #38bdf8;
    --c-warn:      #fbbf24;
    --c-danger:    #f87171;
    --c-success:   #4ade80;
    --c-text:      #ffffff;
    --c-text-dim:  #cbd5e1;
    --c-form-bg:   #ffffff;
    --c-form-text: #0f172a;
    --c-form-border: #cbd5e1;
    --c-shadow:    rgba(0, 0, 0, 0.25);

    --radius:      14px;
    --radius-sm:   8px;
    --gap:         1.5rem;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--c-text);
    background: linear-gradient(135deg, var(--c-bg-from) 0%, var(--c-bg-to) 100%);
    background-attachment: fixed;
}

a { color: var(--c-accent); text-decoration: none; }
a:hover { color: var(--c-accent-2); text-decoration: underline; }

/* ------------------------------------------------------------ Navbar ----- */
.navbar {
    background: var(--c-surface);
    color: var(--c-text);
    padding: 0.9rem 2rem;
    display: flex; align-items: center; justify-content: space-between;
    box-shadow: 0 4px 20px var(--c-shadow);
    position: sticky; top: 0; z-index: 100;
}
.navbar .brand {
    font-weight: 700; font-size: 1.25rem; letter-spacing: 0.5px;
    color: var(--c-text); display: flex; align-items: center; gap: 0.5rem;
}
.navbar .brand .logo {
    width: 32px; height: 32px; border-radius: 8px;
    background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
    display: inline-flex; align-items: center; justify-content: center;
    color: var(--c-surface); font-weight: 900;
}
.navbar nav { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.navbar nav a {
    color: var(--c-text); padding: 0.45rem 0.9rem; border-radius: var(--radius-sm);
    transition: background 0.2s;
}
.navbar nav a:hover, .navbar nav a.active {
    background: var(--c-surface-2); text-decoration: none;
}

/* ------------------------------------------------------------ Layout ---- */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}
.page-title {
    font-size: 1.8rem; font-weight: 700; margin: 0 0 0.5rem 0;
    color: var(--c-text);
}
.page-subtitle { color: var(--c-text-dim); margin: 0 0 2rem 0; }

/* ------------------------------------------------------------ Cards ---- */
.card {
    background: var(--c-surface);
    color: var(--c-text);
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: 0 8px 24px var(--c-shadow);
    margin-bottom: var(--gap);
}
.card h2 { margin-top: 0; font-size: 1.25rem; }
.card .muted { color: var(--c-text-dim); font-size: 0.9rem; }

/* Light card for forms / tables (per spec: dark text on white) */
.card-light {
    background: var(--c-form-bg);
    color: var(--c-form-text);
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: 0 8px 24px var(--c-shadow);
    margin-bottom: var(--gap);
}
.card-light h2 { margin-top: 0; color: var(--c-form-text); }

/* ------------------------------------------------------------ Buttons -- */
.btn {
    display: inline-flex; align-items: center; gap: 0.4rem;
    padding: 0.65rem 1.2rem;
    border: none; border-radius: var(--radius-sm);
    background: var(--c-surface);
    color: var(--c-text);
    font-size: 0.95rem; font-weight: 600;
    cursor: pointer; text-decoration: none;
    transition: transform 0.15s, background 0.2s, box-shadow 0.2s;
}
.btn:hover { background: var(--c-surface-2); transform: translateY(-1px); text-decoration: none; color: var(--c-text); }
.btn:active { transform: translateY(0); }
.btn-primary {
    background: linear-gradient(135deg, var(--c-accent) 0%, var(--c-accent-2) 100%);
    color: var(--c-surface);
}
.btn-primary:hover { color: var(--c-surface); filter: brightness(1.05); }
.btn-danger { background: var(--c-danger); color: #4b0c0c; }
.btn-danger:hover { background: #ef4444; color: #fff; }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.85rem; }
.btn-block { width: 100%; justify-content: center; }
.btn-ghost {
    background: transparent; border: 1px solid var(--c-form-border);
    color: var(--c-form-text);
}
.btn-ghost:hover { background: rgba(0,0,0,0.04); color: var(--c-form-text); }

/* ------------------------------------------------------------ Forms ---- */
form label {
    display: block; margin-bottom: 0.4rem;
    font-weight: 600; color: inherit;
}
.form-group { margin-bottom: 1.1rem; }
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="file"],
select, textarea {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--c-form-border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: #fff;
    color: var(--c-form-text);
    font-family: inherit;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--c-accent-2);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.18);
}
.form-error { color: var(--c-danger); font-size: 0.85rem; margin-top: 0.3rem; }
.form-help  { color: #64748b; font-size: 0.85rem; margin-top: 0.3rem; }
.form-row {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}
.checkbox-row {
    display: flex; align-items: center; gap: 0.5rem;
    margin-bottom: 1rem;
}
.checkbox-row input { width: auto; }

/* ------------------------------------------------------------ Tables --- */
table.data {
    width: 100%; border-collapse: collapse;
    background: #fff; color: var(--c-form-text);
    border-radius: var(--radius); overflow: hidden;
}
table.data th, table.data td {
    padding: 0.8rem 1rem; text-align: left;
    border-bottom: 1px solid #e2e8f0;
}
table.data th {
    background: #f1f5f9; font-weight: 700;
    font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px;
    color: #475569;
}
table.data tbody tr:hover { background: #f8fafc; }
table.data tbody tr:last-child td { border-bottom: none; }

/* ------------------------------------------------------------ Badges --- */
.badge {
    display: inline-block; padding: 0.25rem 0.6rem;
    border-radius: 999px; font-size: 0.75rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.5px;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warn    { background: #fef3c7; color: #92400e; }
.badge-danger  { background: #fee2e2; color: #991b1b; }
.badge-info    { background: #dbeafe; color: #1e40af; }
.badge-folder  { background: #ede9fe; color: #5b21b6; }

/* ------------------------------------------------------------ Flashes -- */
.flash-stack { margin-bottom: 1.5rem; }
.flash {
    padding: 0.85rem 1.1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.6rem;
    background: rgba(255,255,255,0.95); color: var(--c-form-text);
    border-left: 4px solid var(--c-accent-2);
    font-weight: 500;
}
.flash.success { border-left-color: var(--c-success); }
.flash.danger  { border-left-color: var(--c-danger); }
.flash.warning { border-left-color: var(--c-warn); }
.flash.info    { border-left-color: var(--c-accent-2); }

/* ------------------------------------------------------------ Stats --- */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem; margin-bottom: 2rem;
}
.stat {
    background: var(--c-surface); padding: 1.25rem; border-radius: var(--radius);
    box-shadow: 0 4px 14px var(--c-shadow);
}
.stat .stat-label {
    font-size: 0.78rem; text-transform: uppercase;
    letter-spacing: 1px; color: var(--c-text-dim); margin-bottom: 0.4rem;
}
.stat .stat-value { font-size: 1.8rem; font-weight: 700; color: var(--c-text); }
.stat .stat-sub   { font-size: 0.85rem; color: var(--c-text-dim); margin-top: 0.3rem; }

/* ------------------------------------------------------------ Footer --- */
footer {
    text-align: center; color: var(--c-text-dim);
    padding: 2rem 1rem; font-size: 0.85rem;
}

/* ------------------------------------------------------------ Toolbar -- */
.toolbar {
    display: flex; gap: 0.6rem; flex-wrap: wrap;
    margin-bottom: 1.5rem; align-items: center;
}
.toolbar .grow { flex: 1; }

/* ------------------------------------------------------------ Modal --- */
.modal-backdrop {
    position: fixed; inset: 0;
    background: rgba(15, 23, 42, 0.65);
    display: none; align-items: center; justify-content: center;
    z-index: 1000;
    padding: 1rem;
}
.modal-backdrop.open { display: flex; }
.modal {
    background: #fff; color: var(--c-form-text);
    border-radius: var(--radius);
    width: min(420px, 100%); padding: 1.75rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.modal h3 { margin-top: 0; }
.modal-actions {
    display: flex; justify-content: flex-end; gap: 0.5rem; margin-top: 1.25rem;
}

/* ------------------------------------------------------------ Inline forms */
.inline-form { display: inline; margin: 0; }

/* ------------------------------------------------------------ Empty state */
.empty {
    text-align: center; padding: 3rem 1rem; color: var(--c-text-dim);
}
.empty .icon { font-size: 3rem; margin-bottom: 0.5rem; opacity: 0.7; }

/* ------------------------------------------------------------ Responsive */
@media (max-width: 720px) {
    .navbar { flex-direction: column; gap: 0.6rem; align-items: stretch; }
    .navbar nav { justify-content: center; }
    .container { margin: 1rem auto; padding: 0 1rem; }
    table.data { font-size: 0.85rem; }
    table.data th, table.data td { padding: 0.5rem 0.6rem; }
}