/* ==========================================================================
   Alupe University — Admission Letter Portal
   Palette drawn from the university crest (flat colors, no gradients):
   purple banner, gold ring, forest green.
   ========================================================================== */

:root {
    --au-purple: #4b2170;
    --au-purple-dark: #3a1958;
    --au-purple-soft: #f3eef8;
    --au-gold: #c39a45;
    --au-gold-dark: #a87f2f;
    --au-green: #1e5c3a;
    --au-ink: #2b2b33;
    --au-muted: #6f6b78;
    --au-bg: #f6f4f9;
    --au-card-bg: #ffffff;
    --au-border: #e4dfec;
    --au-danger-bg: #fdecec;
    --au-danger-border: #f2c4c4;
    --au-danger-text: #922b2b;
    --au-radius: 10px;
    --au-shadow: 0 6px 24px rgba(59, 26, 88, 0.08);
    --au-font: "Segoe UI", "Poppins", system-ui, -apple-system, Arial, sans-serif;
}

/* ---------- Base ---------- */

html {
    height: 100%;
}

body {
    font-family: var(--au-font);
    background-color: var(--au-bg);
    color: var(--au-ink);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
}

.body-content {
    flex: 1 0 auto;
    width: 100%;
}

/* ---------- Navbar ---------- */

.au-navbar {
    background-color: var(--au-purple);
    border-bottom: 4px solid var(--au-gold);
    padding: 0.65rem 0;
}

.au-navbar .navbar-brand {
    color: #ffffff;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.06em;
    display: flex;
    align-items: center;
    gap: 12px;
}

.au-navbar .navbar-brand:hover,
.au-navbar .navbar-brand:focus {
    color: var(--au-gold);
}

.au-navbar-logo {
    height: 44px;
    width: 44px;
    object-fit: contain;
    background-color: #ffffff;
    border-radius: 50%;
    padding: 3px;
    border: 2px solid var(--au-gold);
}

.au-navbar-tagline {
    color: #cbb8dd;
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    display: block;
}

.au-brand-text {
    line-height: 1.2;
}

/* ---------- Page heading ---------- */

.au-page {
    padding: 2.5rem 0 3rem;
}

/* ---------- Card ---------- */

.au-card {
    background-color: var(--au-card-bg);
    border: 1px solid var(--au-border);
    border-top: 5px solid var(--au-purple);
    border-radius: var(--au-radius);
    box-shadow: var(--au-shadow);
}

.au-card-body {
    padding: 2.25rem 2.5rem 2.5rem;
}

.au-crest {
    height: 96px;
    width: 96px;
    object-fit: contain;
    background-color: #ffffff;
    border-radius: 50%;
    border: 3px solid var(--au-gold);
    padding: 6px;
    margin-bottom: 0.9rem;
}

.au-university-name {
    color: var(--au-purple);
    font-weight: 800;
    font-size: 1.45rem;
    letter-spacing: 0.08em;
    margin-bottom: 0.15rem;
}

.au-university-motto {
    color: var(--au-gold-dark);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    margin-bottom: 0;
}

.au-divider {
    border: 0;
    border-top: 1px solid var(--au-border);
    margin: 1.5rem auto;
    width: 70%;
}

.au-card-title {
    color: var(--au-ink);
    font-weight: 700;
    font-size: 1.15rem;
    margin-bottom: 0.35rem;
}

.au-card-subtitle {
    color: var(--au-muted);
    font-size: 0.92rem;
    margin-bottom: 1.75rem;
}

/* ---------- Form ---------- */

.au-form-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--au-ink);
    margin-bottom: 0.45rem;
}

.au-required {
    color: #b02a37;
}

.au-input {
    border: 1.5px solid var(--au-border);
    border-radius: 8px;
    padding: 0.7rem 0.9rem;
    font-size: 1rem;
    color: var(--au-ink);
    background-color: #fbfafd;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.au-input:focus {
    border-color: var(--au-purple);
    background-color: #ffffff;
    box-shadow: 0 0 0 0.2rem rgba(75, 33, 112, 0.15);
    outline: none;
}

.au-input.is-invalid {
    border-color: #b02a37;
    background-color: var(--au-danger-bg);
}

.au-input.is-invalid:focus {
    box-shadow: 0 0 0 0.2rem rgba(176, 42, 55, 0.15);
}

.au-hint {
    color: var(--au-muted);
    font-size: 0.8rem;
    margin-top: 0.35rem;
}

.au-btn {
    background-color: var(--au-purple);
    border: none;
    border-radius: 8px;
    color: #ffffff;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.03em;
    padding: 0.75rem 1rem;
    margin-top: 0.75rem;
    transition: background-color 0.15s ease;
}

.au-btn:hover,
.au-btn:focus {
    background-color: var(--au-purple-dark);
    color: #ffffff;
}

.au-btn:disabled {
    background-color: var(--au-purple);
    opacity: 0.65;
    color: #ffffff;
}

/* ---------- Alerts ---------- */

.au-alert-error {
    background-color: var(--au-danger-bg);
    border: 1px solid var(--au-danger-border);
    border-left: 4px solid var(--au-danger-text);
    border-radius: 8px;
    color: var(--au-danger-text);
    font-size: 0.92rem;
    padding: 0.85rem 1rem;
    margin-bottom: 1.5rem;
}

/* ---------- Letter page ---------- */

.au-letter-toolbar {
    background-color: var(--au-purple);
    border-radius: var(--au-radius) var(--au-radius) 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    padding: 1rem 1.25rem;
}

.au-letter-toolbar-title {
    color: #ffffff;
    font-weight: 700;
    font-size: 1rem;
    margin: 0;
}

.au-letter-toolbar .au-letter-filename {
    color: #cbb8dd;
    margin-bottom: 0;
}

.au-letter-frame {
    width: 100%;
    height: 78vh;
    display: block;
    border: 1px solid var(--au-border);
    border-top: none;
    border-radius: 0 0 var(--au-radius) var(--au-radius);
    background-color: #ffffff;
    box-shadow: var(--au-shadow);
}

.au-embed-fallback {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 100%;
    padding: 2rem 1.5rem;
}

.au-embed-fallback-note {
    color: var(--au-muted);
    font-size: 0.92rem;
    max-width: 420px;
    margin-bottom: 1.5rem;
}

.au-btn-ghost {
    background-color: transparent;
    border: 1.5px solid #cbb8dd;
    border-radius: 8px;
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.7rem 1.1rem;
    white-space: nowrap;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.au-btn-ghost:hover,
.au-btn-ghost:focus {
    background-color: var(--au-purple-dark);
    border-color: #ffffff;
    color: #ffffff;
}

.au-letter-check {
    background-color: var(--au-green);
    border-radius: 50%;
    color: #ffffff;
    font-size: 1.35rem;
    font-weight: 700;
    height: 44px;
    width: 44px;
    line-height: 44px;
    margin: 0 auto 0.75rem;
}

.au-letter-title {
    color: var(--au-ink);
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
}

.au-letter-filename {
    color: var(--au-muted);
    font-size: 0.88rem;
    margin-bottom: 1.25rem;
    word-break: break-all;
}

.au-letter-actions {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.au-letter-actions .btn {
    margin-top: 0;
    min-width: 160px;
}

.au-btn-download {
    background-color: var(--au-gold);
    border: none;
    border-radius: 8px;
    color: var(--au-purple-dark);
    font-weight: 700;
    font-size: 1rem;
    padding: 0.75rem 1.1rem;
    white-space: nowrap;
    transition: background-color 0.15s ease;
}

.au-btn-download:hover,
.au-btn-download:focus {
    background-color: #d5ad57;
    color: var(--au-purple-dark);
}

.au-btn-download.is-downloading {
    opacity: 0.75;
    pointer-events: none;
}

/* ---------- Loading overlay & spinners ---------- */

.au-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(43, 43, 51, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1050;
    padding: 1rem;
}

.au-overlay[hidden] {
    display: none;
}

.au-overlay-box {
    background-color: #ffffff;
    border-radius: var(--au-radius);
    box-shadow: var(--au-shadow);
    max-width: 340px;
    padding: 2rem 1.75rem;
    text-align: center;
}

.au-overlay-title {
    color: var(--au-ink);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.35rem;
}

.au-overlay-note {
    color: var(--au-muted);
    font-size: 0.85rem;
    margin-bottom: 0;
}

.au-spinner {
    border: 4px solid var(--au-purple-soft);
    border-top-color: var(--au-purple);
    border-radius: 50%;
    height: 48px;
    width: 48px;
    margin: 0 auto 1rem;
    animation: au-spin 0.8s linear infinite;
}

.au-btn-spinner {
    display: inline-block;
    vertical-align: -3px;
    border: 2.5px solid rgba(58, 25, 88, 0.25);
    border-top-color: var(--au-purple-dark);
    border-radius: 50%;
    height: 16px;
    width: 16px;
    animation: au-spin 0.8s linear infinite;
}

@keyframes au-spin {
    to {
        transform: rotate(360deg);
    }
}

/* ---------- Footer ---------- */

.au-footer {
    flex-shrink: 0;
    background-color: var(--au-purple-dark);
    border-top: 4px solid var(--au-gold);
    color: #cbb8dd;
    font-size: 0.85rem;
    text-align: center;
    padding: 1.1rem 1rem;
    margin-top: 3rem;
}

.au-footer p {
    margin: 0;
}

/* ---------- Responsive ---------- */

@media (max-width: 576px) {
    .au-card-body {
        padding: 1.5rem 1.25rem 1.75rem;
    }

    .au-university-name {
        font-size: 1.2rem;
    }

    .au-letter-actions {
        width: 100%;
    }

    .au-letter-actions .btn {
        flex: 1 1 auto;
        min-width: 0;
    }

    .au-letter-frame {
        height: 70vh;
    }

    .au-page {
        padding: 1.25rem 0 2rem;
    }
}