/* ============================================
   Decaboy - Common Styles (Light & Dark Theme)
   ============================================ */

/* CSS Variables - Light Theme (default) */
:root {
    --primary: #e63946;
    --primary-dark: #c1121f;
    --primary-light: #ff6b6b;
    --secondary: #1d3557;
    --accent: #457b9d;
    --accent-light: #a8dadc;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-card: #ffffff;
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8888a0;
    --text-inverse: #ffffff;
    
    --border-color: #e0e0e8;
    --border-light: #f0f0f5;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 50px;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Oswald', 'Inter', sans-serif;
    
    --header-height: 64px;
    --max-width: 1200px;
    --transition: all 0.3s ease;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --primary: #ff4757;
    --primary-dark: #e63946;
    --primary-light: #ff6b81;
    --secondary: #457b9d;
    --accent: #a8dadc;
    --accent-light: #f1faee;
    
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: #1c2333;
    
    --text-primary: #e6edf3;
    --text-secondary: #b0b8c1;
    --text-muted: #6e7681;
    --text-inverse: #0d1117;
    
    --border-color: #30363d;
    --border-light: #21262d;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   HEADER
   ============================================ */
.site-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.logo-icon {
    font-size: 1.8rem;
}

.main-nav .nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.nav-link.active {
    color: var(--primary);
    background: rgba(230, 57, 70, 0.08);
}

.btn-primary-nav {
    background: var(--primary);
    color: var(--text-inverse) !important;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.btn-primary-nav:hover {
    background: var(--primary-dark) !important;
    transform: translateY(-1px);
}

.btn-logout {
    color: var(--primary);
/*    border: 1px solid var(--border-color);*/
}

.btn-logout:hover {
    background: rgba(230, 57, 70, 0.08);
    border-color: var(--primary);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    margin-left: 8px;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
    line-height: 1.4;
}

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

.btn-primary {
    background: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: var(--text-inverse);
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.3);
}

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

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(230, 57, 70, 0.05);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1.05rem;
}

.btn-full {
    width: 100%;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

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

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ALERTS
   ============================================ */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.alert-error {
    background: rgba(230, 57, 70, 0.1);
    border: 1px solid rgba(230, 57, 70, 0.2);
    color: var(--primary);
}

.alert-success {
    background: rgba(46, 204, 113, 0.1);
    border: 1px solid rgba(46, 204, 113, 0.2);
    color: #2ecc71;
}

.alert-info {
    background: rgba(69, 123, 157, 0.1);
    border: 1px solid rgba(69, 123, 157, 0.2);
    color: var(--accent);
}

/* ============================================
   TABLES
   ============================================ */
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.history-table th {
    background: var(--bg-secondary);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.history-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
    white-space: nowrap;
}

.history-table tbody tr:hover {
    background: var(--bg-secondary);
}

.exercise-link {
    font-weight: 600;
    color: var(--text-primary);
}

.exercise-link:hover {
    color: var(--primary);
}

.muscle-tag-small {
    display: inline-block;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    background: rgba(69, 123, 157, 0.1);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 500;
}

/* ============================================
   CARDS & SECTIONS
   ============================================ */
.section-padding {
    padding: 80px 0;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 48px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.highlight {
    color: var(--primary);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-color);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
}

.empty-state h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* ============================================
   AUTH PAGES (Login, Register, Forgot)
   ============================================ */
.auth-container {
    min-height: calc(100vh - var(--header-height) - 100px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-md);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 16px;
}

.auth-header h1 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.auth-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-form .form-options {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 16px;
}

.forgot-link {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.forgot-link:hover {
    color: var(--primary);
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-footer a {
    font-weight: 600;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0 20px;
    margin-top: auto;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.footer-brand {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-brand .logo-text {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    text-transform: uppercase;
}

.footer-tagline {
    width: 100%;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
}

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

.footer-links h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.footer-links ul {
    list-style: none;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-light);
    padding-top: 16px;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        padding: 16px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }

    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-nav .nav-list {
        flex-direction: column;
        gap: 4px;
    }

    .nav-link {
        width: 100%;
        padding: 12px 16px;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .section-padding {
        padding: 50px 0;
    }

    .auth-card {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 15px;
    }

    .container {
        padding: 0 16px;
    }
}

/* ============================================
   UTILITY
   ============================================ */
.required {
    color: var(--primary);
}

.inline-form {
    display: inline;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Selection */
::selection {
    background: var(--primary);
    color: var(--text-inverse);
}