/* =========================
   Design Tokens – Pointercrate-style palette
========================= */
:root {
    /* Primary brand colors */
    --color-background:          #f4f5f7;
    --color-background-card:     #ffffff;
    --color-background-sidebar:  #f8f9fb;
    --color-on-background:       #1f2937;
    --color-on-background-muted: #6b7280;
    --color-background-hover:    #eef0f5;
    --color-on-background-hover: #1f2937;

    /* Accent – Pointercrate blue */
    --color-primary:         #4a90d9;
    --color-primary-dark:    #2c6fad;
    --color-primary-light:   #7ab3e8;
    --color-on-primary:      #ffffff;

    /* Navy header */
    --color-header-bg:       #1a1a2e;
    --color-header-accent:   #16213e;

    /* Borders & shadows */
    --color-border:          #dde1ea;
    --color-shadow:          rgba(0, 0, 0, 0.08);
    --color-shadow-hover:    rgba(0, 0, 0, 0.16);

    /* Semantic */
    --color-error:           #e53e3e;
    --color-on-error:        #ffffff;
    --color-success:         #38a169;

    /* Card/UI radius & sizing */
    --radius-sm:   0.375rem;
    --radius-md:   0.5rem;
    --radius-lg:   0.75rem;
    --radius-xl:   1rem;

    /* Transitions */
    --transition-fast:   0.15s ease;
    --transition-smooth: 0.25s ease;
}

/* =========================
   Dark Mode
========================= */
main.dark,
header.dark,
.auth-modal-overlay.dark,
footer.dark {
    color-scheme: dark;

    --color-background:          #0d0d1a;
    --color-background-card:     #131325;
    --color-background-sidebar:  #0f0f20;
    --color-on-background:       #e5e7eb;
    --color-on-background-muted: #9ca3af;
    --color-background-hover:    #1c1c35;
    --color-on-background-hover: #f9fafb;

    --color-primary:         #5ba3f5;
    --color-primary-dark:    #3d7de0;
    --color-primary-light:   #93c5fd;

    --color-border:          #2a2a4a;
    --color-shadow:          rgba(0, 0, 0, 0.4);
    --color-shadow-hover:    rgba(0, 0, 0, 0.6);

    --color-error:           #fc8181;
    --color-on-error:        #1a1a2e;
}

/* =========================
   Base Layout
========================= */
html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
    background: var(--color-background);
    color: var(--color-on-background);
    font-family: 'Nunito', 'Lexend Deca', sans-serif;
    transition:
        background var(--transition-smooth),
        color var(--transition-smooth);
}

/* =========================
   Header
========================= */
header {
    display: flex;
    align-items: center;
    padding: 0 2.5rem;
    height: 4rem;
    background-color: var(--color-header-bg);
    color: #ffffff;
    gap: 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 16px rgba(0,0,0,0.4);
    transition: background var(--transition-smooth);
}

header.dark {
    background-color: #08081a;
}

header .logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    flex-shrink: 0;
}

header .logo h2 {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #ffffff;
    font-family: 'Lexend Deca', sans-serif;
}

header .logo p {
    font-size: 0.7rem;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.05em;
    line-height: 1;
    font-family: 'Nunito', sans-serif;
    font-weight: 400;
    margin-top: 2px;
}

header .nav {
    flex: 1;
}

/* =========================
   Main Layout
========================= */
main {
    height: 0;
    flex: 1;
    display: grid;
    grid-template-columns: minmax(16rem, 1fr) minmax(16rem, 2fr) minmax(16rem, 1fr);
    grid-template-rows: minmax(0, 1fr);
    column-gap: 0;
    background-color: var(--color-background);
    color: var(--color-on-background);
    overflow: hidden;
    position: relative;
}

/* Subtle decorative top stripe */
main::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary-dark), var(--color-primary), var(--color-primary-light));
    z-index: 10;
    pointer-events: none;
}

/* =========================
   Column scroll zones
========================= */
main > div {
    overflow-y: auto;
    position: relative;
    z-index: 1;
}

/* Left sidebar – level list */
main > div:first-child {
    background: var(--color-background-sidebar);
    border-right: 1px solid var(--color-border);
}

/* Right sidebar – meta */
main > div:last-child {
    background: var(--color-background-sidebar);
    border-left: 1px solid var(--color-border);
}

/* Submit page overrides the 3-col grid and acts as its own scroll root */
main.page-submit {
    display: block;
    overflow-y: auto;
    height: 100%;
}

/* =========================
   Spinner
========================= */
.spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    grid-column: span 3;
}

/* =========================
   Inputs (global)
========================= */
input[type="checkbox"] {
    height: 1.25rem;
    width: 1.25rem;
    cursor: pointer;
    margin: 0;
    accent-color: var(--color-primary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"] {
    background: var(--color-background-card);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.65rem 0.9rem;
    color: var(--color-on-background);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
    width: 100%;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(74,144,217,0.18);
}

/* =========================
   Tabs – Pointercrate underline style
========================= */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--color-border);
}

.tabs button {
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.tabs .active,
.tabs .selected {
    border-bottom: 2px solid var(--color-primary) !important;
    color: var(--color-primary) !important;
    font-weight: 700;
}