/* Learning Page Styles - Spring Atlas */
/* Optimized for the learning interface and user experience */

/* Learning Layout */
.learning-page {
    background: linear-gradient(135deg, var(--color-neutral-50) 0%, var(--color-primary-50) 100%);
    min-height: 100vh;
}

.learning-main {
    padding-top: 4rem; /* Account for fixed nav */
}

.container {
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Section Headers */
.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-neutral-900);
    text-align: center;
    margin-bottom: var(--space-4);
    line-height: 1.2;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-neutral-600);
    text-align: center;
    margin-bottom: var(--space-12);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* Authentication Section */
.auth-section {
    padding: var(--space-20) 0;
    background: white;
    border-bottom: 1px solid var(--color-neutral-200);
}

.auth-card {
    max-width: 480px;
    margin: 0 auto;
    background: white;
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-lg);
}

.auth-tabs {
    display: flex;
    margin-bottom: var(--space-8);
    background: var(--color-neutral-100);
    border-radius: var(--radius-lg);
    padding: var(--space-1);
}

.auth-tab {
    flex: 1;
    padding: var(--space-3) var(--space-6);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-neutral-600);
    cursor: pointer;
    transition: all var(--transition-base);
}

.auth-tab:hover,
.auth-tab:focus {
    color: var(--color-neutral-900);
    background: var(--color-neutral-200);
}

.auth-tab.active {
    background: white;
    color: var(--color-primary-600);
    box-shadow: var(--shadow-sm);
}

/* Forms */
.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

.setup-form {
    max-width: 800px;
    margin: 0 auto;
}

.form-section {
    margin-bottom: var(--space-12);
}

.form-section-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-6);
}

.form-field {
    margin-bottom: var(--space-6);
}

.form-field label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-neutral-700);
    margin-bottom: var(--space-2);
}

.form-field input[type="email"],
.form-field input[type="text"],
.form-field input[type="password"],
.form-field select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-neutral-300);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    background: white;
    transition: all var(--transition-base);
}

.form-field input:focus,
.form-field select:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-field input:invalid {
    border-color: var(--color-error);
}

.password-field {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-neutral-500);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast);
}

.password-toggle:hover,
.password-toggle:focus {
    color: var(--color-neutral-700);
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.field-hint {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-500);
    margin-top: var(--space-1);
}

.field-error {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--space-1);
    min-height: 1.2em;
}

.form-button {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    background: var(--color-primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.form-button:hover:not(:disabled) {
    background: var(--color-primary-700);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.form-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.form-button-primary {
    background: var(--color-primary-600);
}

.form-button-large {
    padding: var(--space-5) var(--space-8);
    font-size: var(--font-size-lg);
}

.button-text {
    transition: opacity var(--transition-fast);
}

.button-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
}

.button-loading svg {
    animation: spin 1s linear infinite;
}

.form-button.loading .button-text {
    opacity: 0;
}

.form-button.loading .button-loading {
    display: block;
}

.auth-feedback {
    margin-top: var(--space-4);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.auth-feedback.success {
    background: var(--color-success);
    color: white;
}

.auth-feedback.error {
    background: var(--color-error);
    color: white;
}

/* Radio Options */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.radio-option {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4);
    border: 2px solid var(--color-neutral-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.radio-option:hover {
    border-color: var(--color-neutral-300);
    background: var(--color-neutral-50);
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.radio-indicator {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--color-neutral-400);
    border-radius: 50%;
    background: white;
    position: relative;
    transition: all var(--transition-base);
    flex-shrink: 0;
    margin-top: 2px;
}

.radio-option input[type="radio"]:checked ~ .radio-indicator {
    border-color: var(--color-primary-600);
    background: var(--color-primary-600);
}

.radio-option input[type="radio"]:checked ~ .radio-indicator::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.5rem;
    height: 0.5rem;
    background: white;
    border-radius: 50%;
}

.radio-content strong {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-neutral-900);
    margin-bottom: var(--space-1);
}

.radio-content p {
    font-size: var(--font-size-sm);
    color: var(--color-neutral-600);
    line-height: 1.5;
}

/* Checkbox Options */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.checkbox-option:hover {
    border-color: var(--color-neutral-300);
    background: var(--color-neutral-50);
}

.checkbox-option input[type="checkbox"] {
    position: absolute;
    opacity: 0;
}

.checkbox-indicator {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--color-neutral-400);
    border-radius: var(--radius-md);
    background: white;
    position: relative;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.checkbox-option input[type="checkbox"]:checked ~ .checkbox-indicator {
    border-color: var(--color-primary-600);
    background: var(--color-primary-600);
}

.checkbox-option input[type="checkbox"]:checked ~ .checkbox-indicator::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 5px;
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-option span {
    font-size: var(--font-size-base);
    color: var(--color-neutral-700);
}

/* Select Field */
.select-field {
    max-width: 400px;
}

.select-field label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-neutral-700);
    margin-bottom: var(--space-2);
}

.select-field select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-neutral-300);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    background: white;
    cursor: pointer;
    transition: all var(--transition-base);
}

.select-field select:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

/* Range Field */
.range-field {
    max-width: 600px;
}

.range-field label {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-neutral-700);
    margin-bottom: var(--space-4);
}

.range-slider {
    width: 100%;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-neutral-200);
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--color-primary-600);
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.range-slider::-webkit-slider-thumb:hover {
    background: var(--color-primary-700);
    transform: scale(1.1);
}

.range-slider::-moz-range-thumb {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    background: var(--color-primary-600);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.range-slider::-moz-range-thumb:hover {
    background: var(--color-primary-700);
    transform: scale(1.1);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--color-neutral-500);
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: center;
    margin-top: var(--space-12);
}

/* Learning Setup Section */
.learning-setup {
    padding: var(--space-20) 0;
    background: white;
}

/* Learning Interface */
.learning-interface {
    min-height: 70vh;
    background: white;
}

.topic-input-section {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-purple-600));
    color: white;
    padding: var(--space-16) 0;
}

.topic-input-section .section-title {
    color: white;
    margin-bottom: var(--space-8);
}

.topic-form {
    max-width: 800px;
    margin: 0 auto;
}

.topic-input-group {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.topic-input-group input {
    flex: 1;
    padding: var(--space-4) var(--space-6);
    border: none;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.topic-input-group input:focus {
    outline: none;
    background: white;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.3);
}

.topic-submit {
    padding: var(--space-4) var(--space-6);
    background: white;
    color: var(--color-primary-600);
    border: none;
    border-radius: var(--radius-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.topic-submit:hover,
.topic-submit:focus {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    outline: none;
}

.topic-suggestions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: center;
}

.suggestions-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.suggestion-chip {
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.suggestion-chip:hover,
.suggestion-chip:focus {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-1px);
}

/* Learning Content Section */
.learning-content-section {
    padding: var(--space-16) 0;
}

.content-placeholder {
    text-align: center;
    padding: var(--space-20) var(--space-8);
    color: var(--color-neutral-500);
}

.placeholder-icon {
    margin-bottom: var(--space-6);
    opacity: 0.3;
}

.content-placeholder h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-neutral-700);
    margin-bottom: var(--space-3);
}

.content-placeholder p {
    font-size: var(--font-size-lg);
    line-height: 1.6;
}

/* Mobile Navigation for Learning */
.nav-tab-bar {
    display: none;
    gap: var(--space-2);
    background: var(--color-neutral-100);
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    margin: 0 var(--space-4);
    max-width: fit-content;
}

.nav-tab {
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-neutral-600);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-tab:hover,
.nav-tab:focus {
    color: var(--color-neutral-900);
    background: var(--color-neutral-200);
}

.nav-tab[aria-current="page"] {
    background: white;
    color: var(--color-primary-600);
    box-shadow: var(--shadow-sm);
}

.nav-tab-streak {
    background: var(--color-success);
    color: white;
    font-weight: 600;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }

    .section-title {
        font-size: var(--font-size-3xl);
    }

    .section-subtitle {
        font-size: var(--font-size-base);
    }

    .auth-card {
        margin: 0 var(--space-4);
        padding: var(--space-6);
    }

    .radio-group {
        gap: var(--space-3);
    }

    .radio-option {
        padding: var(--space-3);
    }

    .checkbox-group {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }

    .topic-input-group {
        flex-direction: column;
        gap: var(--space-3);
    }

    .topic-suggestions {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-2);
    }

    .suggestions-label {
        text-align: center;
        margin-bottom: var(--space-2);
    }

    .nav-tab-bar {
        display: flex;
        margin: var(--space-4) auto;
    }

    .nav-section-title {
        display: block;
        font-size: var(--font-size-xs);
        font-weight: 600;
        text-transform: uppercase;
        color: var(--color-neutral-500);
        margin-bottom: var(--space-2);
        padding: 0 var(--space-4);
    }

    .nav-link-featured {
        background: var(--color-primary-600);
        color: white;
        border-radius: var(--radius-md);
        margin: var(--space-1) var(--space-4);
    }
}

/* Loading States */
.loading-skeleton {
    background: linear-gradient(90deg, var(--color-neutral-200) 25%, var(--color-neutral-100) 50%, var(--color-neutral-200) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

.loading-skeleton.text {
    height: 1em;
    margin-bottom: var(--space-2);
}

.loading-skeleton.title {
    height: 2em;
    width: 70%;
    margin-bottom: var(--space-4);
}

.loading-skeleton.paragraph {
    height: 4em;
    margin-bottom: var(--space-4);
}

/* Error States */
.error-state {
    text-align: center;
    padding: var(--space-12) var(--space-6);
    color: var(--color-error);
}

.error-state h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.error-state p {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-6);
    color: var(--color-neutral-600);
}

.error-state button {
    padding: var(--space-3) var(--space-6);
    background: var(--color-primary-600);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
}

.error-state button:hover,
.error-state button:focus {
    background: var(--color-primary-700);
    transform: translateY(-1px);
}