/**
 * OpinionsHub Main Stylesheet
 * Professional, clean design with soft colors
 */

/* ============================================
   RESET & BASE STYLES
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   LAYOUT
   ============================================ */

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-container {
    display: flex;
    flex: 1;
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
}

/* Left Navigation */
.nav-sidebar {
    width: var(--nav-width);
    padding: var(--space-lg);
    border-right: 1px solid var(--color-border-primary);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

/* Main Content */
.main-content {
    flex: 1;
    min-width: 0;
    max-width: var(--content-max-width);
    border-right: 1px solid var(--color-border-primary);
}

/* Right Sidebar */
.right-sidebar {
    width: var(--sidebar-width);
    padding: var(--space-lg);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav-logo {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--space-xl);
    text-decoration: none;
    display: block;
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: var(--space-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: background-color var(--transition-fast);
}

.nav-link:hover {
    background-color: var(--color-bg-hover);
}

.nav-link.active {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}

.nav-icon {
    width: 24px;
    height: 24px;
    margin-right: var(--space-md);
}

.compose-button {
    width: 100%;
    margin-top: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.compose-button:hover {
    background-color: var(--color-primary-hover);
}

.user-menu {
    margin-top: auto;
    padding-top: var(--space-xl);
}

.user-menu-button {
    display: flex;
    align-items: center;
    width: 100%;
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    border: none;
    background: transparent;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.user-menu-button:hover {
    background-color: var(--color-bg-hover);
}

/* ============================================
   HEADER
   ============================================ */

.page-header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-primary);
    padding: var(--space-md) var(--space-lg);
    z-index: var(--z-sticky);
    backdrop-filter: blur(10px);
    background-color: rgba(var(--color-bg-primary), 0.8);
}

.header-title {
    font-size: var(--text-xl);
    font-weight: 700;
}

.header-tabs {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-md);
}

.header-tab {
    padding: var(--space-md) 0;
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}

.header-tab:hover {
    color: var(--color-text-primary);
}

.header-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* ============================================
   OPINION CARD
   ============================================ */

.opinion-card {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border-primary);
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.opinion-card:hover {
    background-color: var(--color-bg-secondary);
}

.opinion-header {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.opinion-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    object-fit: cover;
    background-color: var(--color-bg-tertiary);
}

.opinion-author-info {
    flex: 1;
    min-width: 0;
}

.opinion-author-name {
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

.opinion-author-name:hover {
    text-decoration: underline;
}

.opinion-username {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.opinion-time {
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
    white-space: nowrap;
}

.opinion-content {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-md);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.opinion-edited {
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
    font-style: italic;
    margin-top: var(--space-sm);
}

.opinion-actions {
    display: flex;
    gap: var(--space-xl);
    color: var(--color-text-tertiary);
}

.opinion-action-button {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.opinion-action-button:hover {
    background-color: var(--color-bg-hover);
}

.opinion-action-button.active {
    color: var(--color-primary);
}

.opinion-action-button.liked {
    color: var(--color-error);
}

/* ============================================
   COMPOSER
   ============================================ */

.composer-container {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border-primary);
}

.composer-form {
    display: flex;
    gap: var(--space-md);
}

.composer-textarea {
    flex: 1;
    min-height: 80px;
    padding: var(--space-md);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    resize: vertical;
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
}

.composer-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.composer-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-md);
}

.composer-char-count {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.composer-char-count.warning {
    color: var(--color-warning);
}

.composer-char-count.error {
    color: var(--color-error);
}

.composer-submit {
    padding: var(--space-sm) var(--space-xl);
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.composer-submit:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
}

.composer-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ============================================
   FEED
   ============================================ */

.feed-container {
    min-height: 100vh;
}

.feed-empty {
    padding: var(--space-2xl);
    text-align: center;
    color: var(--color-text-secondary);
}

.feed-loading {
    padding: var(--space-lg);
    text-align: center;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border-primary);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

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

/* ============================================
   PROFILE
   ============================================ */

.profile-header-container {
    border-bottom: 1px solid var(--color-border-primary);
    padding: var(--space-lg);
}

.profile-banner {
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    border-radius: var(--radius-lg);
    margin-bottom: calc(var(--space-2xl) * -1);
}

.profile-info {
    padding: 0 var(--space-lg);
}

.profile-avatar-large {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-full);
    border: 4px solid var(--color-bg-primary);
    object-fit: cover;
    background-color: var(--color-bg-tertiary);
    margin-bottom: var(--space-md);
}

.profile-actions {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.profile-display-name {
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.profile-username {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-md);
}

.profile-bio {
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-md);
}

.profile-stats {
    display: flex;
    gap: var(--space-xl);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.profile-stat strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    font-size: var(--text-base);
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary-light);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-text-primary);
}

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

/* ============================================
   MODAL
   ============================================ */

.modal-backdrop {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal-backdrop);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal-content {
    background-color: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--text-2xl);
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: var(--space-sm);
}

.modal-body {
    padding: var(--space-lg);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-md);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: var(--text-base);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-error {
    color: var(--color-error);
    font-size: var(--text-sm);
    margin-top: var(--space-sm);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */

#toast-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.toast {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

.toast-info {
    background-color: var(--color-info);
    color: white;
}

/* ============================================
   SEARCH
   ============================================ */

.search-box {
    position: relative;
    margin-bottom: var(--space-lg);
}

.search-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    padding-left: 48px;
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-full);
    background-color: var(--color-bg-secondary);
}

.search-icon {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
}

/* ============================================
   TRENDING SECTION
   ============================================ */

.trending-section {
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.trending-title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.trending-item {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.trending-item:hover {
    background-color: var(--color-bg-hover);
}

.trending-category {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.trending-topic {
    font-weight: 600;
    margin: var(--space-xs) 0;
}

.trending-count {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.hidden {
    display: none !important;
}

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

.mt-auto {
    margin-top: auto;
}

.flex {
    display: flex;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-md {
    gap: var(--space-md);
}