/* Páginas auth / home StudyBuddy */

.auth-shell {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
}

.auth-shell::before {
    content: "";
    position: absolute;
    top: -8rem;
    right: -6rem;
    width: 22rem;
    height: 22rem;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--color-primary) 8%, transparent);
    filter: blur(48px);
    pointer-events: none;
}

.auth-shell::after {
    content: "";
    position: absolute;
    bottom: -6rem;
    left: -4rem;
    width: 18rem;
    height: 18rem;
    border-radius: 9999px;
    background: color-mix(in srgb, var(--color-primary-container) 12%, transparent);
    filter: blur(40px);
    pointer-events: none;
}

.auth-card {
    position: relative;
    z-index: 1;
    width: min(420px, 100%);
}

.auth-input {
    width: 100%;
    border: none;
    border-radius: 1rem;
    padding: 0.9rem 1rem;
    background: var(--color-surface-container-low);
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 16px;
    box-shadow: var(--shadow-clay-inset);
    outline: none;
    transition: box-shadow var(--duration-press);
}

.auth-input:focus {
    box-shadow:
        var(--shadow-clay-inset),
        0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.auth-label {
    display: block;
    margin-bottom: 0.4rem;
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-on-surface-variant);
}

.auth-alert {
    border-radius: 1rem;
    padding: 0.85rem 1rem;
    font-size: 14px;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.auth-alert--error {
    background: #fef2f2;
    color: #991b1b;
}

.auth-alert--success {
    background: #ecfdf5;
    color: #065f46;
}

.auth-alert--info {
    background: var(--color-surface-container);
    color: var(--color-on-surface-variant);
}

.google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    padding: 0.9rem 1rem;
    border-radius: 1rem;
    background: var(--color-surface-container-lowest);
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    box-shadow: var(--shadow-clay-card);
    transition: transform var(--duration-press), box-shadow var(--duration-clay);
}

.google-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-clay-card-hover);
}

.google-btn:active {
    transform: scale(0.98);
}

.google-btn__icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.25rem 0;
    color: var(--color-outline);
    font-size: 12px;
    font-weight: 500;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--color-surface-dim);
}

.home-hero-art {
    background:
        radial-gradient(circle at 30% 30%, rgba(168, 184, 255, 0.45), transparent 55%),
        linear-gradient(145deg, #1e40af 0%, #00288e 55%, #131b2e 100%);
}

/* -------------------------------------------------------------------------- */
/* Auth modal / dialog                                                        */
/* -------------------------------------------------------------------------- */

body.auth-modal-open {
    overflow: hidden;
}

.auth-dialog {
    border: none;
    padding: 0;
    background: transparent;
    max-width: calc(100vw - 2rem);
    width: min(420px, 100%);
    margin: auto;
}

.auth-dialog::backdrop {
    background: rgba(19, 27, 46, 0.45);
    backdrop-filter: blur(6px);
    animation: auth-backdrop-in 0.2s ease-out;
}

.auth-dialog[open] {
    animation: auth-dialog-in 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.auth-dialog__panel {
    position: relative;
    width: 100%;
    padding: 1.75rem 1.5rem 1.5rem;
    max-height: min(90dvh, 720px);
    overflow-y: auto;
    background: var(--color-surface-container-lowest);
}

.auth-dialog__close {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 2.25rem;
    height: 2.25rem;
    border: none;
    border-radius: 9999px;
    background: var(--color-surface-container-low);
    color: var(--color-on-surface-variant);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-clay-inset);
    transition: transform 0.15s ease, color 0.15s ease;
}

.auth-dialog__close:hover {
    color: var(--color-primary);
    transform: scale(0.96);
}

.auth-dialog__tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem;
    padding: 0.3rem;
    margin-bottom: 1.25rem;
    border-radius: 1rem;
    background: var(--color-surface-container);
    box-shadow: var(--shadow-clay-inset);
}

.auth-dialog__tab {
    border: none;
    border-radius: 0.85rem;
    padding: 0.65rem 0.5rem;
    background: transparent;
    color: var(--color-on-surface-variant);
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.auth-dialog__tab.is-active {
    background: var(--color-primary);
    color: var(--color-on-primary);
    box-shadow: var(--shadow-clay-button);
}

.auth-dialog__form {
    display: none;
}

.auth-dialog__form.is-visible {
    display: block;
}

@keyframes auth-dialog-in {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes auth-backdrop-in {
    from { opacity: 0; }
    to { opacity: 1; }
}