/* =============================================
   Dev Spark Learn — Design System (Spotify-inspired)
   ============================================= */

:root {
    --color-bg: #121212;
    --color-surface: #181818;
    --color-surface-alt: #282828;
    --color-surface-hover: #333333;
    --color-accent: #7c4dff;
    --color-accent-hover: #9c6fff;
    --color-text-primary: #ffffff;
    --color-text-secondary: #b3b3b3;
    --color-border: #333333;
    --sidebar-width: 260px;
    --player-bar-height: 90px;
    --border-radius-pill: 500px;
    --border-radius-card: 8px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
}

html, body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    margin: 0;
    padding: 0;
}

a, .btn-link {
    color: var(--color-accent);
    transition: color var(--transition-fast);
}

a:hover, .btn-link:hover {
    color: var(--color-accent-hover);
}

/* ---- Buttons ---- */
.btn-primary {
    color: #fff;
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    border-radius: var(--border-radius-pill);
    padding: 0.45rem 1.2rem;
    font-weight: 600;
    font-size: 0.875rem;
    letter-spacing: 0.02em;
    transition: background-color var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #fff;
}

.btn-primary:active {
    transform: scale(0.97);
}

.btn-outline-secondary {
    color: var(--color-text-secondary);
    border-color: var(--color-border);
    background-color: transparent;
    border-radius: var(--border-radius-pill);
    padding: 0.45rem 1.2rem;
    font-weight: 600;
    font-size: 0.875rem;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.btn-outline-secondary:hover {
    color: var(--color-text-primary);
    border-color: var(--color-text-primary);
    background-color: transparent;
}

.btn-outline-secondary:active {
    transform: scale(0.97);
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.15rem rgba(124, 77, 255, 0.4);
    outline: none;
}

/* ---- Focus rings (accessibility) ---- */
*:focus {
    outline: none;
}

*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    box-shadow: none;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-primary);
    font-weight: 700;
    letter-spacing: -0.01em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

h1:focus {
    outline: none;
}

.valid.modified:not([type=checkbox]) {
    outline: 1px solid #26b050;
}

.invalid {
    outline: 1px solid #e50000;
}

.validation-message {
    color: #e50000;
}

.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
}

    .blazor-error-boundary::after {
        content: "An error has occurred."
    }

.darker-border-checkbox.form-check-input {
    border-color: #929292;
}

.form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
}

.form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
    text-align: start;
}

.imgLogo {
    max-height: 500px;
    width: auto;
    height: auto;
    max-width: 100%;
}

/* ---- Dark form controls ---- */
.form-control, .form-select {
    background-color: var(--color-surface-alt);
    border-color: var(--color-border);
    color: var(--color-text-primary);
    border-radius: 4px;
}

.form-control:focus, .form-select:focus {
    background-color: var(--color-surface-alt);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    box-shadow: 0 0 0 0.15rem rgba(124, 77, 255, 0.3);
}

.form-control::placeholder {
    color: var(--color-text-secondary);
}

/* ---- Text utilities ---- */
.text-muted {
    color: var(--color-text-secondary) !important;
}

/* ---- Cards (Bootstrap override for dark theme) ---- */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-card);
    color: var(--color-text-primary);
    transition: background-color var(--transition-normal), transform var(--transition-fast);
}

.card:hover {
    background-color: var(--color-surface-alt);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--color-border);
}

/* ---- Skeleton loading animation ---- */
.skeleton {
    background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-alt) 50%, var(--color-surface) 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.4s infinite;
    border-radius: var(--border-radius-card);
}

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

/* ---- Page content padding for player bar ---- */
article.content {
    padding-bottom: calc(var(--player-bar-height) + 1rem) !important;
    animation: page-fade-in 0.25s ease;
}

@keyframes page-fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
    article.content {
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
    }
}