/**
 * Layout
 * Navigation, page structure, and responsive layout
 */

/* ============================================
   APP CONTAINER
   ============================================ */

.app-container {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

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

.main-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    height: var(--nav-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
}

.nav-brand {
    display: flex;
    align-items: center;
.brand-logo {
    height: 40px;
    width: auto;
}

@media (min-width: 768px) {
    .brand-logo {
        height: 48px;
    }
}
}

.nav-brand a {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: var(--font-bold);
    font-size: var(--text-lg);
}

.brand-icon {
    font-size: var(--text-xl);
}

.brand-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Mobile nav toggle */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 10px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Nav menu (mobile first) */
.nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-secondary);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
}

.nav-menu.active {
    transform: translateX(0);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: var(--font-medium);
}

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

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

.nav-icon {
    font-size: var(--text-lg);
}

.nav-logout {
    margin-top: auto;
    color: var(--error);
}

.nav-logout:hover {
    background: var(--error-muted);
    color: var(--error);
}

/* Desktop navigation */
@media (min-width: 768px) {
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        flex-direction: row;
        transform: none;
        padding: 0;
        gap: var(--space-1);
        background: transparent;
        overflow: visible;
    }
    
    .nav-link {
        padding: var(--space-2) var(--space-3);
    }
    
    .nav-logout {
        margin-top: 0;
        margin-left: var(--space-4);
    }
}

/* ============================================
   MAIN CONTENT
   ============================================ */

.main-content {
    flex: 1;
    padding: var(--space-4);
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
}

@media (min-width: 640px) {
    .main-content {
        padding: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .main-content {
        padding: var(--space-8);
    }
}

/* ============================================
   PAGE HEADERS
   ============================================ */

.page-header {
    margin-bottom: var(--space-6);
}

.page-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
}

.page-subtitle {
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

.page-header-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-4);
}

@media (min-width: 640px) {
    .page-header {
        display: flex;
        align-items: flex-start;
        justify-content: space-between;
        gap: var(--space-4);
    }
    
    .page-header-actions {
        margin-top: 0;
    }
}

/* ============================================
   GRID LAYOUTS
   ============================================ */

.grid-cols-1 { grid-template-columns: 1fr; }

.stats-grid {
    display: grid;
    gap: var(--space-4);
    grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 640px) {
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.content-grid {
    display: grid;
    gap: var(--space-6);
}

@media (min-width: 768px) {
    .content-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .content-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

.auth-container {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: var(--bg-primary);
}

.auth-card {
    width: 100%;
    max-width: 400px;
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.auth-logo {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.auth-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-subtitle {
    color: var(--text-tertiary);
}

.auth-form {
    background: var(--surface-1);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
}

.auth-footer {
    text-align: center;
    margin-top: var(--space-6);
    color: var(--text-tertiary);
    font-size: var(--text-sm);
}

.auth-footer a {
    font-weight: var(--font-medium);
}

/* ============================================
   SECTION HEADERS
   ============================================ */

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.section-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin: 0;
}

.section-link {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

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

.workout-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid var(--border-primary);
}

@media (min-width: 640px) {
    .workout-header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.workout-date {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.workout-date-input {
    max-width: 180px;
}

.workout-timer {
    font-family: var(--font-mono);
    font-size: var(--text-xl);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.workout-exercises {
    margin-bottom: var(--space-6);
}

.workout-notes {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-primary);
}

/* ============================================
   EXERCISE SET ROWS
   ============================================ */

.set-row {
    display: grid;
    grid-template-columns: 60px 1fr 1fr 40px;
    gap: var(--space-3);
    align-items: center;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--border-primary);
}

.set-row:last-child {
    border-bottom: none;
}

.set-number {
    font-weight: var(--font-semibold);
    color: var(--text-tertiary);
    text-align: center;
}

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

.set-delete {
    color: var(--error);
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.set-delete:hover {
    opacity: 1;
}

/* ============================================
   HISTORY LIST
   ============================================ */

.history-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--surface-1);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-3);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.history-item:hover {
    border-color: var(--border-secondary);
    transform: translateX(4px);
}

.history-date {
    text-align: center;
    min-width: 50px;
}

.history-date-day {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    line-height: 1;
}

.history-date-month {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    text-transform: uppercase;
}

.history-content {
    flex: 1;
    min-width: 0;
}

.history-title {
    font-weight: var(--font-medium);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.history-stats {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.history-type {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

.history-type.weights {
    background: var(--accent-secondary);
    background: rgba(124, 92, 255, 0.2);
    color: var(--accent-secondary);
}

.history-type.cardio {
    background: rgba(0, 212, 170, 0.2);
    color: var(--accent-primary);
}

/* ============================================
   SEARCH & FILTER BAR
   ============================================ */

.search-bar {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
    .search-bar {
        flex-direction: row;
    }
}

.search-input-wrapper {
    position: relative;
    flex: 1;
}

.search-input {
    padding-left: var(--space-10);
}

.search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.filter-select {
    min-width: 150px;
}

/* ============================================
   TABS
   ============================================ */

.tabs {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-1);
    background: var(--surface-1);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    overflow-x: auto;
}

.tab {
    flex: 1;
    min-width: 100px;
    padding: var(--space-3) var(--space-4);
    text-align: center;
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.tab.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

/* ============================================
   BOTTOM ACTION BAR (Mobile)
   ============================================ */

.bottom-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--space-4);
    display: flex;
    gap: var(--space-3);
    z-index: var(--z-sticky);
}

.bottom-bar .btn {
    flex: 1;
}

@media (min-width: 768px) {
    .bottom-bar {
        display: none;
    }
}

/* Add padding to main content when bottom bar is present */
.has-bottom-bar {
    padding-bottom: 80px;
}

@media (min-width: 768px) {
    .has-bottom-bar {
        padding-bottom: 0;
    }
}