/**
 * Component Styles - Clinical Research Design System
 * Refined, professional UI components
 */

/* ===== Base Reset for Components ===== */
[x-cloak] {
    display: none !important;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-family: var(--font-family-sans);
    font-size: var(--font-size-normal);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    text-decoration: none;
    border-radius: var(--radius-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 100%);
    pointer-events: none;
}

.btn:focus {
    outline: none;
    box-shadow: var(--shadow-focus-strong);
}

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

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-fg-onEmphasis);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-small);
}

.btn-primary:hover {
    background-color: var(--color-accent-emphasis);
    border-color: var(--color-accent-emphasis);
    box-shadow: var(--shadow-medium);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--color-bg-default);
    color: var(--color-fg-default);
    border-color: var(--color-border-default);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
    background-color: var(--color-bg-subtle);
    border-color: var(--color-border-emphasis);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-fg-muted);
    border-color: transparent;
}

.btn-ghost:hover {
    background-color: var(--color-bg-subtle);
    color: var(--color-fg-default);
}

.btn-danger {
    background-color: var(--color-danger);
    color: var(--color-fg-onEmphasis);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background-color: #b02535;
}

.btn-large {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-body);
    border-radius: var(--radius-large);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-family: var(--font-family-sans);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-small);
    color: var(--color-fg-default);
    letter-spacing: var(--letter-spacing-wide);
}

.form-input {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-family: var(--font-family-sans);
    font-size: var(--font-size-normal);
    color: var(--color-fg-default);
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-medium);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-inner);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: var(--shadow-focus);
}

.form-input::placeholder {
    color: var(--color-fg-subtle);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath fill='%235c6478' d='M4.427 7.427l3.396 3.396a.25.25 0 00.354 0l3.396-3.396A.25.25 0 0011.396 7H4.604a.25.25 0 00-.177.427z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-3) center;
    padding-right: var(--spacing-8);
}

.form-hint {
    margin-top: var(--spacing-2);
    font-size: var(--font-size-small);
    color: var(--color-fg-muted);
}

.form-error {
    margin-top: var(--spacing-2);
    font-size: var(--font-size-small);
    color: var(--color-danger);
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

/* ===== Cards ===== */
.card {
    background-color: var(--color-bg-default);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-xlarge);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-medium);
    position: relative;
}

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: var(--radius-xlarge) var(--radius-xlarge) 0 0;
}

.card-header {
    margin-bottom: var(--spacing-5);
    padding-bottom: var(--spacing-5);
    border-bottom: 1px solid var(--color-border-muted);
}

.card-title {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-xlarge);
    font-weight: var(--font-weight-semibold);
    color: var(--color-fg-default);
    letter-spacing: var(--letter-spacing-tight);
}

.card-subtitle {
    margin-top: var(--spacing-2);
    font-size: var(--font-size-normal);
    color: var(--color-fg-muted);
}

/* ===== Page Layouts ===== */
.page-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-canvas);
    position: relative;
}

/* Subtle dot pattern background */
.page-container::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(var(--color-border-subtle) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
    z-index: 0;
}

.page-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: var(--spacing-6);
    position: relative;
    z-index: 1;
}

.page-narrow {
    width: 100%;
    max-width: 440px;
}

.page-header {
    padding: var(--spacing-5) var(--spacing-6);
    background-color: var(--color-bg-default);
    border-bottom: 1px solid var(--color-border-muted);
    position: relative;
    z-index: 1;
}

/* ===== Topic Selection ===== */
.topic-card {
    padding: var(--spacing-4) var(--spacing-5);
    border: 2px solid var(--color-border-default);
    border-radius: var(--radius-large);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--color-bg-default);
    position: relative;
}

.topic-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--color-accent);
    border-radius: 0 var(--radius-small) var(--radius-small) 0;
    transition: height var(--transition-normal);
}

.topic-card:hover {
    border-color: var(--color-accent-muted);
    box-shadow: var(--shadow-small);
}

.topic-card:hover::before {
    height: 40%;
}

.topic-card.selected {
    border-color: var(--color-accent);
    background: var(--color-accent-subtle);
    box-shadow: var(--shadow-medium);
}

.topic-card.selected::before {
    height: 70%;
}

.topic-card .topic-title {
    font-family: var(--font-family-sans);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-body);
    color: var(--color-fg-default);
    margin-bottom: var(--spacing-1);
}

.topic-card .topic-description {
    font-size: var(--font-size-small);
    color: var(--color-fg-muted);
    line-height: var(--line-height-relaxed);
}

/* ===== Group Selection ===== */
.group-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-3);
}

.group-option {
    padding: var(--spacing-4) var(--spacing-3);
    text-align: center;
    border: 2px solid var(--color-border-default);
    border-radius: var(--radius-large);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--color-bg-default);
    position: relative;
    overflow: hidden;
}

.group-option::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.group-option:hover {
    border-color: var(--color-accent-muted);
    box-shadow: var(--shadow-small);
}

.group-option:hover::after {
    transform: scaleX(0.5);
}

.group-option.selected {
    border-color: var(--color-accent);
    background: var(--color-accent-subtle);
}

.group-option.selected::after {
    transform: scaleX(1);
}

.group-option .group-letter {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-display);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-2);
}

.group-option .group-desc {
    font-size: var(--font-size-xs);
    color: var(--color-fg-muted);
    line-height: var(--line-height-normal);
}

/* ===== Alerts ===== */
.alert {
    padding: var(--spacing-4) var(--spacing-5);
    border-radius: var(--radius-medium);
    margin-bottom: var(--spacing-4);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    font-size: var(--font-size-normal);
    line-height: var(--line-height-relaxed);
}

.alert::before {
    content: "";
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    margin-top: 2px;
}

.alert-info {
    background-color: var(--color-accent-subtle);
    border: 1px solid var(--color-accent-muted);
    color: var(--color-accent-emphasis);
}

.alert-info::before {
    background: var(--color-accent);
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath fill-rule='evenodd' d='M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z' clip-rule='evenodd'/%3E%3C/svg%3E");
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath fill-rule='evenodd' d='M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z' clip-rule='evenodd'/%3E%3C/svg%3E");
}

.alert-success {
    background-color: var(--color-success-subtle);
    border: 1px solid var(--color-success-border);
    color: var(--color-success);
}

.alert-success::before {
    background: var(--color-success);
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z' clip-rule='evenodd'/%3E%3C/svg%3E");
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath fill-rule='evenodd' d='M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z' clip-rule='evenodd'/%3E%3C/svg%3E");
}

.alert-warning {
    background-color: var(--color-warning-subtle);
    border: 1px solid var(--color-warning-border);
    color: var(--color-warning);
}

.alert-danger {
    background-color: var(--color-danger-subtle);
    border: 1px solid var(--color-danger-border);
    color: var(--color-danger);
}

/* ===== Completion Stats ===== */
.completion-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-4);
    margin-top: var(--spacing-5);
}

.stat-box {
    text-align: center;
    padding: var(--spacing-5) var(--spacing-4);
    background: linear-gradient(135deg, var(--color-bg-subtle) 0%, var(--color-bg-muted) 100%);
    border-radius: var(--radius-large);
    border: 1px solid var(--color-border-muted);
    position: relative;
    overflow: hidden;
}

.stat-box::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 0 0 var(--radius-small) var(--radius-small);
}

.stat-box .stat-number {
    font-family: var(--font-family-mono);
    font-size: var(--font-size-display);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
    line-height: 1;
}

.stat-box .stat-label {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-fg-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-caps);
    margin-top: var(--spacing-2);
}

/* ===== Loading States ===== */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--color-border-default);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== Instructions Modal ===== */
.instructions-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 31, 46, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    animation: overlay-enter 0.2s ease-out;
}

@keyframes overlay-enter {
    from { opacity: 0; }
    to { opacity: 1; }
}

.instructions-modal {
    background-color: var(--color-bg-default);
    border-radius: var(--radius-xlarge);
    padding: var(--spacing-7);
    max-width: 560px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xlarge);
    animation: modal-enter 0.3s var(--transition-spring);
    position: relative;
}

@keyframes modal-enter {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.instructions-modal::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    border-radius: var(--radius-xlarge) var(--radius-xlarge) 0 0;
}

.instructions-modal h2 {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-xlarge);
    font-weight: var(--font-weight-semibold);
    color: var(--color-fg-default);
    margin-bottom: var(--spacing-4);
}

.instructions-modal h3 {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-semibold);
    color: var(--color-fg-default);
    margin-top: var(--spacing-5);
    margin-bottom: var(--spacing-3);
}

.instructions-modal p {
    font-size: var(--font-size-normal);
    color: var(--color-fg-muted);
    line-height: var(--line-height-relaxed);
}

.instructions-modal ul {
    margin: var(--spacing-3) 0;
    padding-left: var(--spacing-5);
}

.instructions-modal li {
    margin-bottom: var(--spacing-2);
    color: var(--color-fg-muted);
    font-size: var(--font-size-normal);
    line-height: var(--line-height-relaxed);
}

.instructions-modal li strong {
    color: var(--color-fg-default);
}

.instructions-modal .btn {
    margin-top: var(--spacing-5);
    width: 100%;
}

/* ===== Keyboard hints ===== */
kbd {
    display: inline-block;
    padding: 2px 8px;
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
    color: var(--color-fg-default);
    background: var(--color-bg-muted);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-small);
    box-shadow: 0 1px 0 var(--color-border-emphasis);
}

/* ===== Submit Confirmation Modal ===== */
.submit-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(26, 31, 46, 0.7);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    animation: overlay-enter 0.2s ease-out;
}

.submit-modal {
    background-color: var(--color-bg-default);
    border-radius: var(--radius-xlarge);
    padding: var(--spacing-7);
    max-width: 420px;
    width: 90%;
    box-shadow: var(--shadow-xlarge);
    animation: modal-enter 0.3s var(--transition-spring);
    position: relative;
}

.submit-modal::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-success) 100%);
    border-radius: var(--radius-xlarge) var(--radius-xlarge) 0 0;
}

.submit-modal-header {
    text-align: center;
    margin-bottom: var(--spacing-5);
}

.submit-modal-header svg {
    color: var(--color-accent);
    margin-bottom: var(--spacing-3);
}

.submit-modal-header h2 {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-xlarge);
    font-weight: var(--font-weight-semibold);
    color: var(--color-fg-default);
    margin: 0;
}

.submit-modal-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    background: var(--color-bg-subtle);
    border-radius: var(--radius-large);
    border: 1px solid var(--color-border-muted);
}

.submit-stat {
    text-align: center;
}

.submit-stat-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-fg-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-caps);
    margin-bottom: var(--spacing-1);
}

.submit-stat-value {
    display: block;
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xlarge);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
}

.submit-stat-value.warning {
    color: var(--color-warning);
}

.submit-modal-actions {
    display: flex;
    gap: var(--spacing-3);
    margin-top: var(--spacing-5);
}

.submit-modal-actions .btn {
    flex: 1;
}

/* ===== Essay Preview ===== */
.essay-preview {
    max-height: 200px;
    overflow-y: auto;
    padding: var(--spacing-4);
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-medium);
    font-family: var(--font-family-serif);
    font-size: var(--font-size-small);
    line-height: var(--line-height-loose);
    color: var(--color-fg-default);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .group-selector {
        grid-template-columns: repeat(2, 1fr);
    }

    .completion-stats {
        grid-template-columns: 1fr;
    }

    .card {
        padding: var(--spacing-5);
    }

    .instructions-modal {
        padding: var(--spacing-5);
    }
}