/* ==========================================================================
   Base Styles - Mobile First
   ========================================================================== */

/* CSS Variables für konsistentes Design - Dark Theme */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #a78bfa;
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --error-color: #f87171;
    --info-color: #22d3ee;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-light: #64748b;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    --border-color: #334155;
    --border-radius: 8px;
    --box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
    --box-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);

    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;

    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    --transition-speed: 0.3s;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

/* ==========================================================================
   Header & Navigation - Mobile First
   ========================================================================== */

.header {
    background-color: var(--bg-primary);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    position: relative;
}

.header__logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    z-index: 10;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 0.2px;
    transition: color 0.2s ease;
    background: linear-gradient(120deg, var(--primary-color), var(--secondary-color), #22d3ee);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: logoShimmer 6s ease-in-out infinite;
}

.header__logo:hover {
    animation-duration: 3.5s;
}

@keyframes logoShimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Burger Menu Button */
.header__burger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 10;
}

.header__burger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.header__burger.is-active .header__burger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.header__burger.is-active .header__burger-line:nth-child(2) {
    opacity: 0;
}

.header__burger.is-active .header__burger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--bg-primary);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 5;
    padding-top: 80px;
    overflow-y: auto;
}

.nav.is-open {
    transform: translateX(0);
}

.nav__list {
    list-style: none;
    display: flex;
    flex-direction: column;
}

.nav__item {
    border-bottom: 1px solid var(--border-color);
}

.nav__link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.nav__link:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

.nav__link--active {
    background-color: rgba(99, 102, 241, 0.15);
    color: var(--primary-light);
    border-radius: var(--border-radius);
}

/* Nav Buttons */
.nav__btn {
    display: block;
    margin: var(--spacing-sm) var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
}

.nav__btn--outline {
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    background: transparent;
}

.nav__btn--outline:hover {
    background-color: var(--primary-color);
    color: white;
}

.nav__btn--primary {
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

.nav__btn--primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    color: white;
}

.nav__item--auth {
    border-bottom: none;
    padding: var(--spacing-xs) 0;
}

.nav__btn--active {
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.3);
}

/* User Dropdown */
.nav__item--dropdown {
    position: relative;
}

.nav__dropdown-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.nav__user-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 0.875rem;
    font-weight: 600;
}

.nav__user-name {
    flex: 1;
    text-align: left;
}

.nav__dropdown-arrow {
    transition: transform 0.2s;
}

.nav__item--dropdown.is-open .nav__dropdown-arrow {
    transform: rotate(180deg);
}

.nav__dropdown {
    display: none;
    background-color: var(--bg-tertiary);
}

.nav__item--dropdown.is-open .nav__dropdown {
    display: block;
}

.nav__dropdown-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    padding-left: calc(var(--spacing-lg) + 40px);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: background-color 0.2s, color 0.2s;
}

.nav__dropdown-link:hover {
    background-color: var(--bg-secondary);
    color: var(--primary-color);
}

.nav__dropdown-link--logout {
    color: var(--error-color);
}

.nav__dropdown-link--logout:hover {
    color: var(--error-color);
    background-color: rgba(248, 113, 113, 0.15);
}

.nav__dropdown-link--button {
    width: 100%;
    text-align: left;
    background: none;
    border: 0;
    cursor: pointer;
    font: inherit;
    color: inherit;
    text-decoration: none;
    appearance: none;
}

.nav__dropdown-divider {
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-xs) var(--spacing-lg);
}

/* Overlay */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 4;
}

.nav-overlay.is-visible {
    display: block;
}

/* ==========================================================================
   Buttons - Mobile First
   ========================================================================== */

.btn, .btn-primary, .btn-secondary, .btn-outline, .btn-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-decoration: none;
}

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

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

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

.btn-secondary:hover {
    background-color: #7c3aed;
    color: white;
}

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

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

.btn-danger {
    background-color: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

.btn-danger:hover {
    background-color: #dc2626;
    color: white;
}

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

/* ==========================================================================
   Messages / Alerts
   ========================================================================== */

.messages-container {
    position: fixed;
    top: 70px;
    right: var(--spacing-md);
    z-index: 9999;
    max-width: 400px;
    width: calc(100% - 2rem);
}

.alert {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease-out;
}

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

.alert-success {
    background-color: rgba(52, 211, 153, 0.15);
    color: #34d399;
    border-left: 4px solid var(--success-color);
}

.alert-error {
    background-color: rgba(248, 113, 113, 0.15);
    color: #f87171;
    border-left: 4px solid var(--error-color);
}

.alert-warning {
    background-color: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background-color: rgba(34, 211, 238, 0.15);
    color: #22d3ee;
    border-left: 4px solid var(--info-color);
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
    transition: opacity var(--transition-speed);
}

.alert-close:hover {
    opacity: 1;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background-color: #020617;
    color: var(--text-secondary);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3, .footer-section h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--text-light);
    margin-bottom: 0;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--text-secondary);
    transition: color var(--transition-speed);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-light);
}

/* ==========================================================================
   Media Queries - Tablet & Desktop
   ========================================================================== */

/* Tablet (768px and up) */
@media (min-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }

    .container {
        padding: 0 var(--spacing-xl);
    }

    .main-content {
        padding: var(--spacing-2xl) 0;
    }

    /* Header Desktop */
    .header__burger {
        display: none;
    }

    .nav {
        position: static;
        width: auto;
        height: auto;
        background: transparent;
        box-shadow: none;
        transform: none;
        padding-top: 0;
        overflow: visible;
    }

    .nav__list {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-xs);
    }

    .nav__item {
        border-bottom: none;
    }

    .nav__link {
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--border-radius);
    }

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

    .nav__btn {
        margin: 0;
        display: inline-block;
    }

    .nav__item--auth {
        padding: 0;
    }

    /* Desktop Dropdown */
    .nav__dropdown-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: var(--border-radius);
    }

    .nav__user-name {
        display: none;
    }

    .nav__dropdown {
        position: absolute;
        top: calc(100% + 8px);
        right: 0;
        min-width: 200px;
        background-color: var(--bg-primary);
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow-lg);
        border: 1px solid var(--border-color);
        z-index: 100;
    }

    .nav__dropdown-link {
        padding: var(--spacing-sm) var(--spacing-md);
        padding-left: var(--spacing-md);
    }

    .nav__dropdown-link:first-child {
        border-radius: var(--border-radius) var(--border-radius) 0 0;
    }

    .nav__dropdown-link:last-child {
        border-radius: 0 0 var(--border-radius) var(--border-radius);
    }

    .nav__dropdown-divider {
        margin: var(--spacing-xs) 0;
    }

    .footer-content {
        grid-template-columns: repeat(3, 1fr);
    }

    .messages-container {
        width: 400px;
    }
}

/* Desktop (1024px and up) */
@media (min-width: 1024px) {
    h1 { font-size: 3rem; }

    .container {
        padding: 0 var(--spacing-2xl);
    }

    .main-content {
        padding: var(--spacing-2xl) 0 3rem;
    }
}