/* =============================================================
   Wysto — Design System
   Mobile-first, max-width 480px centered
   Colors aligned with prototype (2026-03)
   ============================================================= */

/* ---------------------------------------------------------
   Design Tokens
   --------------------------------------------------------- */
:root {
    /* Backgrounds */
    --color-bg:           #F7F8FA;
    --color-surface:      #FFFFFF;
    --color-input-bg:     #F8FAFC;

    /* Borders */
    --color-border:       #E2E8F0;
    --color-border-focus: #3D8EF0;

    /* Brand primary (dark navy) */
    --color-primary:      #1B2E4B;
    --color-primary-dark: #2A4A7F;
    --color-primary-bg:   #EBF3FE;

    /* Accent (interactive blue — CTAs, links, focus) */
    --color-accent:       #3D8EF0;
    --color-accent-bg:    #EBF3FE;

    /* Text */
    --color-text:         #1A202C;
    --color-text-muted:   #64748B;
    --color-text-subtle:  #A0AEC0;
    --color-text-inverse: #FFFFFF;

    /* Semantic */
    --color-success:      #1A9E6E;
    --color-success-bg:   #E6F7F2;
    --color-warning:      #E67E22;
    --color-warning-bg:   #FEF5EC;
    --color-error:        #E53E3E;
    --color-error-bg:     #FEF0F0;

    /* Status (invoice) */
    --color-draft:        #7C3AED;
    --color-draft-bg:     #F3EFFE;
    --color-issued:       #3D8EF0;
    --color-paid:         #1A9E6E;
    --color-overdue:      #E53E3E;

    /* Radii */
    --radius-sm:   6px;
    --radius-md:   10px;
    --radius-btn:  12px;
    --radius-lg:   16px;
    --radius-full: 999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);

    /* Typography */
    --font-sans: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

    /* Layout */
    --topbar-height:     56px;
    --bottomnav-height:  64px;
    --content-max-width: 480px;
}

@media (min-width: 768px) {
    :root {
        --content-max-width: 720px;
    }
}

@media (min-width: 1024px) {
    :root {
        --content-max-width: 800px;
    }
}

/* ---------------------------------------------------------
   Reset & Base
   --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
    height: 100%;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

/* ---------------------------------------------------------
   App Shell
   --------------------------------------------------------- */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100dvh;
}

/* ---------------------------------------------------------
   TopBar
   --------------------------------------------------------- */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 18px;
    gap: 10px;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.topbar-brand {
    font-size: 18px;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
    flex-shrink: 0;
}

.topbar-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-text);
    flex-shrink: 0;
}

.topbar-back {
    color: var(--color-accent);
    font-size: 18px;
    padding: 4px 6px;
    flex-shrink: 0;
}

.topbar-spacer { flex: 1; }

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* ---------------------------------------------------------
   Auto-save indicator
   --------------------------------------------------------- */
.autosave {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
}

.autosave-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-draft);
    flex-shrink: 0;
}

.autosave-dot.saved  { background: var(--color-success); }
.autosave-dot.saving { background: var(--color-warning); animation: pulse 1s infinite; }
.autosave-dot.draft  { background: var(--color-draft); }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50%       { opacity: 0.4; }
}

/* ---------------------------------------------------------
   Main content area
   --------------------------------------------------------- */
.app-content {
    flex: 1;
    margin-top: var(--topbar-height);
    margin-bottom: var(--bottomnav-height);
    padding: 20px 18px 24px;
    width: 100%;
    max-width: var(--content-max-width);
    margin-left: auto;
    margin-right: auto;
}

@media (min-width: 768px) {
    .app-content { padding: 28px 24px; }
}

/* ---------------------------------------------------------
   Bottom navigation
   --------------------------------------------------------- */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottomnav-height);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 100;
    box-shadow: 0 -1px 3px 0 rgb(0 0 0 / 0.05);
}

@media (min-width: 768px) {
    .bottom-nav {
        left: 50%;
        transform: translateX(-50%);
        width: var(--content-max-width);
        border-radius: 16px 16px 0 0;
        border-left: 1px solid var(--color-border);
        border-right: 1px solid var(--color-border);
    }
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 16px;
    color: var(--color-text-subtle);
    font-size: 11px;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: color 0.15s;
    cursor: pointer;
    background: none;
    border: none;
    min-width: 64px;
}

.bottom-nav-item:hover,
.bottom-nav-item.active { color: var(--color-primary); }

.bottom-nav-item svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.75;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.bottom-nav-fab {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background: var(--color-accent);
    border-radius: 50%;
    color: var(--color-text-inverse);
    box-shadow: var(--shadow-md);
    transition: background 0.15s, transform 0.15s;
    margin-top: -12px;
}

.bottom-nav-fab:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    transform: scale(1.05);
}

.bottom-nav-fab svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2.25;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* ---------------------------------------------------------
   Cards
   --------------------------------------------------------- */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 14px;
    box-shadow: var(--shadow-sm);
}

.card + .card { margin-top: 10px; }

/* ---------------------------------------------------------
   Buttons
   --------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 13px 16px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-btn);
    border: none;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s, transform 0.1s;
    text-decoration: none;
    white-space: nowrap;
    font-family: var(--font-sans);
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
    width: 100%;
}
.btn-primary:hover:not(:disabled) { background: var(--color-primary-dark); color: var(--color-text-inverse); }

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

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}
.btn-secondary:hover:not(:disabled) { background: var(--color-border); }

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

.btn-danger {
    background: var(--color-error-bg);
    color: var(--color-error);
}
.btn-danger:hover:not(:disabled) { background: var(--color-error); color: var(--color-text-inverse); }

.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-lg { padding: 13px 16px; font-size: 15px; }

/* ---------------------------------------------------------
   Form controls
   --------------------------------------------------------- */
.form-group { margin-bottom: 16px; }

.form-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-control {
    display: block;
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-input-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    appearance: none;
}

.form-control:focus {
    outline: none;
    background: var(--color-surface);
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgb(61 142 240 / 0.13);
}

.form-control.is-invalid { border-color: var(--color-error); }
.form-control.is-invalid:focus { box-shadow: 0 0 0 3px rgb(229 62 62 / 0.12); }
.form-control.is-valid { border-color: var(--color-success); }
.form-control.is-valid:focus { box-shadow: 0 0 0 3px rgb(26 158 110 / 0.12); }

.form-hint  { font-size: 11px; color: var(--color-text-subtle); margin-top: 4px; }
.form-error { font-size: 11px; color: var(--color-error);       margin-top: 4px; }

/* ---------------------------------------------------------
   Status badges (with colored dot)
   --------------------------------------------------------- */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
    background: currentColor;
}

.badge-draft    { background: var(--color-draft-bg);   color: var(--color-draft); }
.badge-issued   { background: var(--color-accent-bg);  color: var(--color-accent); }
.badge-sent     { background: var(--color-accent-bg);  color: var(--color-accent); }
.badge-accepted { background: var(--color-success-bg); color: var(--color-success); }
.badge-paid     { background: var(--color-success-bg); color: var(--color-success); }
.badge-overdue  { background: var(--color-error-bg);   color: var(--color-error); }
.badge-rejected { background: var(--color-error-bg);   color: var(--color-error); }

/* ---------------------------------------------------------
   Typography helpers
   --------------------------------------------------------- */
.page-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.3px;
    margin-bottom: 18px;
}

.section-title {
    font-size: 10px;
    font-weight: 700;
    color: var(--color-text-subtle);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 10px;
}

.divider { border: none; border-top: 1px solid var(--color-border); margin: 18px 0; }

/* ---------------------------------------------------------
   Empty state
   --------------------------------------------------------- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 24px;
    flex: 1;
}

.empty-state-icon { font-size: 48px; margin-bottom: 16px; }

.empty-state-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.empty-state-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 28px;
}

/* ---------------------------------------------------------
   Invoice list row
   --------------------------------------------------------- */
.invoice-row {
    display: flex;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    color: inherit;
}

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

.invoice-row-info { flex: 1; }

.invoice-row-client {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
}

.invoice-row-meta {
    font-size: 11px;
    color: var(--color-text-subtle);
    margin-top: 2px;
}

.invoice-row-right { text-align: right; }

.invoice-row-amount {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 4px;
}

/* ---------------------------------------------------------
   Blazor error UI
   --------------------------------------------------------- */
#blazor-error-ui {
    background: var(--color-error-bg);
    border-top: 1px solid var(--color-error);
    bottom: 0;
    box-shadow: 0 -2px 8px rgba(0,0,0,.1);
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
    color: var(--color-error);
    font-size: 14px;
}

#blazor-error-ui .dismiss { cursor: pointer; position: absolute; right: 0.75rem; top: 0.5rem; }