/* =============================================================
   NPay Design System — Ghost-inspired minimal aesthetic
   Design tokens are defined as CSS custom properties here.
   All components reference these tokens; never use raw values.
   ============================================================= */

/* ── Design Tokens ── */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Color palette */
    --color-bg:          #ffffff;
    --color-surface:     #f9fafb;
    --color-border:      #e5e7eb;
    --color-border-dark: #d1d5db;

    --color-text-primary:   #111827;
    --color-text-secondary: #6b7280;
    --color-text-muted:     #9ca3af;

    --color-accent:       #6d28d9;
    --color-accent-hover: #5b21b6;
    --color-accent-light: #f5f3ff;
    --color-accent-border:#ddd6fe;

    --color-success:      #059669;
    --color-success-bg:   #ecfdf5;
    --color-danger:       #dc2626;
    --color-danger-bg:    #fef2f2;

    /* Spacing scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Typography scale */
    --text-xs:   0.75rem;
    --text-sm:   0.875rem;
    --text-base: 1rem;
    --text-lg:   1.125rem;
    --text-xl:   1.25rem;
    --text-2xl:  1.5rem;
    --text-3xl:  1.875rem;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;

    /* Shadows — very subtle, Ghost-style */
    --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08);

    /* Transitions */
    --transition: 150ms ease;
}

/* ── Base reset ── */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    margin: 0;
    padding: 0;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-2) 0;
}

p {
    margin: 0 0 var(--space-4) 0;
    color: var(--color-text-secondary);
}

a {
    color: var(--color-accent);
    text-decoration: none;
}

    a:hover {
        text-decoration: underline;
    }

/* ── Buttons ── */
button {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-4);
    transition: background var(--transition), color var(--transition), border-color var(--transition), opacity var(--transition);
    min-width: unset;
    background: transparent;
    color: var(--color-text-primary);
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

    button:disabled {
        opacity: 0.45;
        cursor: not-allowed;
    }

/* Primary — filled accent */
.btn-primary {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

    .btn-primary:hover:not(:disabled) {
        background: var(--color-accent-hover);
        border-color: var(--color-accent-hover);
        color: #fff;
    }

/* Ghost — outlined */
.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: var(--color-border-dark);
}

    .btn-ghost:hover:not(:disabled) {
        background: var(--color-surface);
        color: var(--color-text-primary);
    }

/* Danger ghost */
.btn-danger {
    background: transparent;
    color: var(--color-danger);
    border-color: transparent;
    padding: 0;
    font-size: var(--text-sm);
}

    .btn-danger:hover:not(:disabled) {
        text-decoration: underline;
        background: transparent;
    }

/* Inline link-style */
.link-button {
    background: none;
    border: none;
    color: var(--color-accent);
    cursor: pointer;
    padding: 0;
    font: inherit;
    font-size: inherit;
    font-weight: 600;
    display: inline;
}

    .link-button:hover:not(:disabled) {
        text-decoration: underline;
    }

    .link-button:disabled {
        opacity: 0.45;
    }

/* ── Form controls ── */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    margin-bottom: var(--space-5);
}

.form-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-primary);
}

.form-input,
.form-select,
.form-textarea {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    background: var(--color-bg);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-md);
    padding: var(--space-2) var(--space-3);
    width: 100%;
    transition: border-color var(--transition), box-shadow var(--transition);
    appearance: none;
}

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
        outline: none;
        border-color: var(--color-accent);
        box-shadow: 0 0 0 3px rgba(109, 40, 217, 0.12);
    }

    .form-input::placeholder,
    .form-textarea::placeholder {
        color: var(--color-text-muted);
    }

.form-select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-3) center;
    padding-right: var(--space-8);
    cursor: pointer;
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

/* ── Divider ── */
.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-6) 0;
}

/* ── Page shell ── */
.npay-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
}

/* ── Top navigation bar ── */
.npay-topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    height: 56px;
    background: rgba(255,255,255,0.95);
    backdrop-filter: saturate(180%) blur(8px);
    -webkit-backdrop-filter: saturate(180%) blur(8px);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 var(--space-8);
    gap: var(--space-8);
}

.npay-topbar-brand {
    font-weight: 700;
    font-size: var(--text-lg);
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    flex-shrink: 0;
}

    .npay-topbar-brand:hover {
        text-decoration: none;
        color: var(--color-accent);
    }

.npay-topbar-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex: 1;
}

.npay-nav-link {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: background var(--transition), color var(--transition);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

    .npay-nav-link:hover {
        background: var(--color-surface);
        color: var(--color-text-primary);
        text-decoration: none;
    }

    .npay-nav-link.active {
        color: var(--color-accent);
        background: var(--color-accent-light);
    }

    .npay-nav-link .material-symbols-outlined {
        font-size: 18px;
    }

.npay-topbar-end {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto;
    flex-shrink: 0;
}

/* ── Main content area ── */
.npay-main {
    flex: 1;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-10) var(--space-8);
}

/* ── Page header ── */
.page-header {
    margin-bottom: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.page-header-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.page-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-1) 0;
}

.page-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* ── Section ── */
.section {
    margin-bottom: var(--space-8);
}

.section-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

/* ── Cards ── */
.npay-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    overflow: hidden;
}

.npay-card-body {
    padding: var(--space-6);
}

.npay-card-hover {
    transition: box-shadow var(--transition), border-color var(--transition);
    cursor: pointer;
}

    .npay-card-hover:hover {
        border-color: var(--color-accent-border);
        box-shadow: var(--shadow-md);
    }

/* ── Summary stat cards ── */
.stat-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5) var(--space-6);
    background: var(--color-bg);
}

.stat-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-xs);
    font-weight: 600;
    padding: 2px var(--space-2);
    border-radius: 999px;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.badge-open {
    background: var(--color-success-bg);
    color: var(--color-success);
}

.badge-closed {
    background: var(--color-surface);
    color: var(--color-text-muted);
}

/* ── Empty state ── */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-8);
    color: var(--color-text-muted);
}

.empty-state .material-symbols-outlined {
    font-size: 40px;
    opacity: 0.3;
    display: block;
    margin-bottom: var(--space-4);
}

.empty-state p {
    font-size: var(--text-sm);
    margin: 0;
    color: var(--color-text-muted);
}

/* ── Settlement list ── */
.settlement-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.settlement-row {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    transition: background var(--transition);
}

    .settlement-row:last-child {
        border-bottom: none;
    }

    .settlement-row:hover {
        background: var(--color-surface);
    }

.settlement-row-title {
    flex: 1;
    min-width: 0;
}

.settlement-row-name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    font-family: var(--font-sans);
    text-align: left;
    min-width: unset;
}

    .settlement-row-name:hover {
        color: var(--color-accent);
        text-decoration: underline;
    }

.settlement-row-desc {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.settlement-row-meta {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-shrink: 0;
}

.settlement-row-date {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.settlement-row-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    opacity: 0;
    transition: opacity var(--transition);
}

.settlement-row:hover .settlement-row-actions {
    opacity: 1;
}

/* ── Tabs ── */
.npay-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--space-6);
}

.npay-tab {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: var(--space-3) var(--space-4);
    margin-bottom: -1px;
    cursor: pointer;
    border-radius: 0;
    min-width: unset;
    transition: color var(--transition), border-color var(--transition);
}

    .npay-tab.active {
        color: var(--color-text-primary);
        border-bottom-color: var(--color-text-primary);
    }

    .npay-tab:hover:not(.active) {
        color: var(--color-text-primary);
        background: none;
    }

/* ── Inline add form (expense / participant) ── */
.inline-form {
    display: flex;
    align-items: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.inline-form-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    flex: 1;
    min-width: 120px;
}

.inline-form-label {
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ── Expense / participant list ── */
.item-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.item-row {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    font-size: var(--text-sm);
}

    .item-row:last-child {
        border-bottom: none;
    }

.item-row-label {
    flex: 1;
    font-weight: 500;
    color: var(--color-text-primary);
}

.item-row-sub {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}

.item-row-amount {
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--color-text-primary);
}

.item-row-action {
    opacity: 0;
    transition: opacity var(--transition);
}

.item-row:hover .item-row-action {
    opacity: 1;
}

/* ── Transfer result ── */
.transfer-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.transfer-card {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-accent-light);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    flex-wrap: wrap;
}

.transfer-from {
    font-weight: 600;
    color: var(--color-text-primary);
}

.transfer-arrow {
    color: var(--color-text-muted);
    font-size: 16px;
}

.transfer-amount {
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--color-accent);
    font-size: var(--text-base);
}

.transfer-to {
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ── Home quick-action cards ── */
.quick-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--space-4);
}

.quick-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    transition: border-color var(--transition), box-shadow var(--transition);
}

    .quick-card:hover {
        border-color: var(--color-accent-border);
        box-shadow: var(--shadow-md);
    }

.quick-card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
}

    .quick-card-icon .material-symbols-outlined {
        font-size: 22px;
    }

.quick-card-title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.quick-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    flex: 1;
    margin: 0;
}

/* ── Loading skeleton ── */
.skeleton {
    background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
    background-size: 200% 100%;
    animation: skeleton-wave 1.4s ease infinite;
    border-radius: var(--radius-sm);
    display: inline-block;
    height: 1em;
}

@keyframes skeleton-wave {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    width: 60%;
    height: 0.9rem;
}

/* ── Alert / info box ── */
.alert-info {
    padding: var(--space-4) var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* ── Blazor error UI ── */
#blazor-error-ui {
    color-scheme: light only;
    background: #fef9c3;
    bottom: 0;
    left: 0;
    right: 0;
    position: fixed;
    padding: var(--space-3) var(--space-5);
    display: none;
    font-size: var(--text-sm);
    border-top: 1px solid #fde68a;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        float: right;
    }

/* ── Responsive ── */
@media (max-width: 640px) {
    .npay-topbar {
        padding: 0 var(--space-4);
        gap: var(--space-4);
    }

    .npay-main {
        padding: var(--space-6) var(--space-4);
    }

    .settlement-row-actions {
        opacity: 1;
    }

    .item-row-action {
        opacity: 1;
    }

    .inline-form {
        flex-direction: column;
        align-items: stretch;
    }

    .inline-form-field {
        min-width: unset;
    }
}