/* ============================================================
   TimeCardCruncher Design Tokens
   ============================================================ */
:root {
    /* Primary text (cool slate) */
    --color-dark-1:       #3B4252;
    --color-dark-2:       #434C5E;
    --color-dark-3:       #4C566A;

    /* Accent (single muted blue) */
    --color-accent:        #5E81AC;
    --color-accent-hover:  #4C6F99;
    --color-accent-active: #3D5E85;
    --color-accent-light:  #D8E4F0;

    /* Surfaces */
    --color-bg:      #F8F9FA;
    --color-surface: #FFFFFF;
    --color-border:  #E2E8F0;

    /* Semantic (muted) */
    --color-success: #2D7A4F;
    --color-error:   #C0392B;
    --color-warning: #D97706;

    /* Semantic tinted surfaces — color-mix recipe */
    --color-success-bg:     color-mix(in srgb, var(--color-success) 8%,  white);
    --color-success-border: color-mix(in srgb, var(--color-success) 30%, white);
    --color-error-bg:       color-mix(in srgb, var(--color-error)   8%,  white);
    --color-error-border:   color-mix(in srgb, var(--color-error)   30%, white);
    --color-warning-bg:     color-mix(in srgb, var(--color-warning) 8%,  white);
    --color-warning-border: color-mix(in srgb, var(--color-warning) 30%, white);

    /* Sidebar opacity tokens */
    --sidebar-text:        rgba(255, 255, 255, 0.70);
    --sidebar-text-strong: #FFFFFF;
    --sidebar-label:       rgba(255, 255, 255, 0.35);
    --sidebar-divider:     rgba(255, 255, 255, 0.10);
    --sidebar-hover-bg:    rgba(255, 255, 255, 0.08);
    --sidebar-active-bg:   rgba(255, 255, 255, 0.12);

    /* Layout */
    --sidebar-width:  240px;
    --topbar-height:  60px;

    /* Spacing scale (strict 8 px rhythm) */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 48px;
    --space-6: 64px;

    /* Border radii */
    --radius-xs: 4px;   /* sidebar toggle hit state */
    --radius-sm: 6px;   /* buttons, inputs, banners */
    --radius-md: 8px;   /* cards, modals */
    --radius-lg: 10px;  /* auth card */

    /* Shadows */
    --shadow-card:    0 1px 3px  rgba(0, 0, 0, 0.06);
    --shadow-auth:    0 2px 8px  rgba(0, 0, 0, 0.06);
    --shadow-modal:   0 8px 32px rgba(0, 0, 0, 0.18);
    --shadow-hover:   0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-sidebar: 4px 0 16px rgba(0, 0, 0, 0.20);
    --scrim:          rgba(0, 0, 0, 0.45);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Type scale (rems) */
    --fs-xs:   0.6875rem; /* nav section label */
    --fs-2xs:  0.75rem;   /* status badges */
    --fs-s:    0.8125rem; /* field hints, tertiary metadata */
    --fs-body: 0.875rem;  /* body, table cells, form inputs */
    --fs-m:    0.9375rem; /* card headers, emphasized body */
    --fs-base: 1rem;      /* top bar title */
    --fs-l:    1.0625rem; /* sidebar brand */
    --fs-xl:   1.125rem;  /* modal titles */
    --fs-2xl:  1.25rem;   /* auth brand */
    --fs-3xl:  1.5rem;    /* auth card h1 */
    --fs-4xl:  2rem;      /* page heading */
    --fs-hero: 2.25rem;   /* dashboard stat number */

    /* Font weights */
    --fw-regular:  400;
    --fw-medium:   500;
    --fw-semibold: 600;
    --fw-bold:     700;

    /* Letter spacing */
    --ls-tight: -0.01em;
    --ls-caps:   0.08em;

    /* Line heights */
    --lh-tight: 1.2;
    --lh-body:  1.6;

    /* Transitions */
    --transition-fast: 100ms ease;
    --transition-base: 150ms ease;
    --transition-slow: 250ms ease;

    /* Z-index scale */
    --z-topbar:   100;
    --z-sidebar:  200;
    --z-backdrop: 150;
    --z-modal:    1000;
}

/* ============================================================
   Base Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    line-height: var(--lh-body);
    color: var(--color-dark-1);
    background: var(--color-bg);
    margin: 0;
}

/* ============================================================
   App Shell — Sidebar Layout
   ============================================================ */
.app-shell {
    display: flex;
    min-height: 100vh;
}

/* ---- Sidebar ---- */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--color-dark-1);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: var(--z-sidebar);
    transition: transform var(--transition-slow);
}

.sidebar-brand {
    padding: var(--space-3) var(--space-3);
    border-bottom: 1px solid var(--sidebar-divider);
    display: flex;
    align-items: center;
    gap: var(--space-1);
    min-height: var(--topbar-height);
}

.sidebar-brand-link {
    color: var(--sidebar-text-strong);
    text-decoration: none;
    font-size: var(--fs-l);
    font-weight: var(--fw-bold);
    letter-spacing: var(--ls-tight);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.sidebar-brand-link:hover { color: var(--sidebar-text-strong); text-decoration: none; }

.sidebar-brand-icon {
    color: var(--color-accent-light);
    font-size: 1.25rem;
}

.sidebar-nav {
    padding: var(--space-1) 0;
    flex: 1;
    overflow-y: auto;
}

.nav-section-label {
    padding: var(--space-2) var(--space-3) var(--space-1);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    text-transform: uppercase;
    letter-spacing: var(--ls-caps);
    color: var(--sidebar-label);
}

.nav-link-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px var(--space-3);
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: var(--fs-m);
    font-weight: var(--fw-regular);
    transition: background var(--transition-base), color var(--transition-base), border-left-color var(--transition-base);
    border-left: 3px solid transparent;
    border-right: 3px solid transparent; /* keeps layout stable */
}

.nav-link-item i {
    font-size: 1rem;
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}

.nav-link-item:hover {
    background: var(--sidebar-hover-bg);
    color: var(--sidebar-text-strong);
    text-decoration: none;
}

.nav-link-item:active {
    background: rgba(255, 255, 255, 0.14);
}

.nav-link-item:focus-visible {
    outline: 2px solid var(--color-accent-light);
    outline-offset: -2px;
}

.nav-link-item.active {
    background: var(--sidebar-active-bg);
    color: var(--sidebar-text-strong);
    border-left-color: var(--color-accent-light);
    font-weight: var(--fw-medium);
}

.sidebar-footer {
    padding: var(--space-2) var(--space-3);
    border-top: 1px solid var(--sidebar-divider);
    font-size: var(--fs-s);
    color: rgba(255, 255, 255, 0.45);
}

/* ---- Main wrapper ---- */
.main-wrapper {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-width: 0;
}

/* ---- Top bar ---- */
.top-bar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--space-4);
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: var(--z-topbar);
    gap: var(--space-2);
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sidebar-toggle {
    display: none; /* hidden on desktop; shown on mobile via media query */
    background: none;
    border: none;
    color: var(--color-dark-3);
    font-size: 1.25rem;
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-xs);
    line-height: 1;
    transition: background var(--transition-base);
}

.sidebar-toggle:hover  { background: var(--color-bg); color: var(--color-dark-1); }
.sidebar-toggle:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.top-bar-page-title {
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    color: var(--color-dark-1);
    margin: 0;
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.top-bar-email {
    font-size: var(--fs-body);
    color: var(--color-dark-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 220px;
}

/* ---- Page content ---- */
.main-content {
    padding: var(--space-4);
    flex: 1;
}

.page-heading {
    font-size: var(--fs-4xl);
    font-weight: var(--fw-bold);
    line-height: var(--lh-tight);
    color: var(--color-dark-1);
    margin: 0 0 var(--space-3);
}

/* ---- Sidebar backdrop (mobile) ---- */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: var(--z-backdrop);
}

.sidebar-backdrop.visible { display: block; }

/* ============================================================
   Auth Layout
   ============================================================ */
.auth-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-4) var(--space-2);
    background: var(--color-bg);
}

.auth-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-auth);
    padding: var(--space-5) var(--space-5);
    width: 100%;
    max-width: 420px;
}

.auth-brand {
    text-align: center;
    margin-bottom: var(--space-4);
}

.auth-brand-name {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    color: var(--color-dark-1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1);
    text-decoration: none;
}

.auth-brand-name:hover { text-decoration: none; color: var(--color-dark-1); }

.auth-brand-icon { color: var(--color-accent); font-size: 1.375rem; }

.auth-card h1 {
    font-size: var(--fs-3xl);
    font-weight: var(--fw-semibold);
    color: var(--color-dark-1);
    margin-bottom: var(--space-3);
    text-align: center;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn-primary {
    background: var(--color-accent);
    color: #fff;
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: var(--fs-body);
    font-weight: var(--fw-medium);
    line-height: var(--lh-body);
    border: none;
    cursor: pointer;
    transition: background var(--transition-base), transform var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    text-decoration: none;
}

.btn-primary:hover  { background: var(--color-accent-hover); color: #fff; text-decoration: none; }
.btn-primary:active { background: var(--color-accent-active); transform: scale(0.98); }
.btn-primary:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

.btn-primary-full { width: 100%; justify-content: center; }

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-dark-2);
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: var(--fs-body);
    font-weight: var(--fw-medium);
    line-height: var(--lh-body);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: background var(--transition-base), border-color var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    text-decoration: none;
}

.btn-secondary:hover  { background: var(--color-bg); border-color: #c8d3e0; color: var(--color-dark-1); text-decoration: none; }
.btn-secondary:active { background: #eaecef; transform: scale(0.98); }
.btn-secondary:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.btn-danger {
    background: var(--color-error);
    color: #fff;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: var(--fs-body);
    font-weight: var(--fw-semibold);
    border: none;
    cursor: pointer;
    transition: background var(--transition-base), transform var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}

.btn-danger:hover  { background: #a93226; color: #fff; text-decoration: none; }
.btn-danger:active { background: #922b21; transform: scale(0.98); }
.btn-danger:focus-visible { outline: 2px solid var(--color-error); outline-offset: 2px; }
.btn-danger:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }

/* Ghost button for logout in top bar */
.btn-ghost {
    background: none;
    color: var(--color-dark-3);
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    font-size: var(--fs-body);
    font-weight: var(--fw-regular);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background var(--transition-base), color var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}

.btn-ghost:hover  { background: var(--color-bg); color: var(--color-dark-1); border-color: var(--color-border); }
.btn-ghost:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* ============================================================
   Forms
   ============================================================ */
.form-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: var(--fs-body);
    font-weight: var(--fw-medium);
    color: var(--color-dark-1);
}

.form-input {
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--fs-base);
    color: var(--color-dark-1);
    background: var(--color-surface);
    transition: border-color var(--transition-base);
    width: 100%;
}

.form-input:focus {
    border-color: var(--color-accent);
    outline: 2px solid var(--color-accent-light);
    outline-offset: 0;
}

.form-input[aria-invalid="true"] { border-color: var(--color-error); }

.field-hint  { font-size: var(--fs-2xs);  color: var(--color-dark-3); }
.field-error { font-size: var(--fs-body); color: var(--color-error); font-weight: var(--fw-medium); }

/* Validation summary (server-side errors) */
.alert-error {
    background: var(--color-error-bg);
    border: 1px solid var(--color-error-border);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-2);
    color: var(--color-error);
    font-size: var(--fs-m);
}

.alert-success {
    background: var(--color-success-bg);
    border: 1px solid var(--color-success-border);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-2);
    color: var(--color-success);
    font-size: var(--fs-m);
}

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

.card-header {
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body   { padding: var(--space-3); }
.card-footer {
    padding: var(--space-2) var(--space-3);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    display: flex;
    gap: var(--space-1);
    justify-content: flex-end;
}

/* ============================================================
   Responsive — Mobile Sidebar
   ============================================================ */
@media (max-width: 767px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-sidebar);
    }

    .main-wrapper {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .main-content {
        padding: var(--space-3);
    }

    .top-bar {
        padding: 0 var(--space-3);
    }

    .top-bar-email {
        display: none; /* hide email on small screens */
    }
}

/* ============================================================
   Type Utilities
   ============================================================ */
.t-display {
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    font-size: 56px;
    line-height: 1;
    letter-spacing: -0.03em;
    color: var(--color-dark-1);
}

.t-title-xl {
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    font-size: 32px;
    line-height: 1.15;
    letter-spacing: -0.015em;
    color: var(--color-dark-1);
}

.t-title-l {
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    font-size: 24px;
    line-height: 1.2;
    letter-spacing: var(--ls-tight);
    color: var(--color-dark-1);
}

.t-title-m {
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    font-size: 18px;
    line-height: 1.25;
    letter-spacing: -0.005em;
    color: var(--color-dark-1);
}

.t-lede {
    font-family: var(--font-sans);
    font-weight: var(--fw-regular);
    font-size: 17px;
    line-height: var(--lh-body);
    color: var(--color-dark-2);
}

.t-body {
    font-family: var(--font-sans);
    font-weight: var(--fw-regular);
    font-size: 14px;
    line-height: var(--lh-body);
    color: var(--color-dark-2);
}

.t-body-s {
    font-family: var(--font-sans);
    font-weight: var(--fw-regular);
    font-size: 13px;
    line-height: 1.55;
    color: var(--color-dark-3);
}

.t-label {
    font-family: var(--font-sans);
    font-weight: var(--fw-semibold);
    font-size: 13px;
    line-height: 1.2;
    color: var(--color-dark-1);
}

.t-eyebrow {
    font-family: var(--font-sans);
    font-weight: var(--fw-semibold);
    font-size: 11px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-dark-3);
}

.t-tabular  { font-variant-numeric: tabular-nums; }

.t-hero-num {
    font-family: var(--font-sans);
    font-weight: var(--fw-bold);
    font-size: 56px;
    line-height: 1;
    letter-spacing: -0.015em;
    font-variant-numeric: tabular-nums;
    color: var(--color-accent);
}

.t-money {
    font-family: var(--font-sans);
    font-weight: var(--fw-semibold);
    font-variant-numeric: tabular-nums;
    color: var(--color-dark-1);
}

.t-id {
    font-family: var(--font-mono);
    font-weight: var(--fw-medium);
    font-size: 13px;
    color: var(--color-dark-3);
}