/* ==========================================
   SOLVERO.DE - COMPONENT LIBRARY
   Wiederverwendbare UI-Komponenten
   ========================================== */

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

.btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    border: var(--border-medium) solid var(--black);
    background: transparent;
    font-size: var(--text-sm);
    font-family: var(--font-body);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--black);
    transition: left var(--transition-base);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

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

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

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

.btn-ghost {
    background: transparent;
    color: var(--black);
    border-color: var(--black);
}

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

.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--text-base);
}

.btn-block {
    display: block;
    width: 100%;
}

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

.btn:disabled:hover::before,
.btn.disabled:hover::before {
    left: -100%;
}

/* ==========================================
   CARDS
   ========================================== */

.card {
    background: var(--white);
    border: var(--border-thin) solid var(--black);
    padding: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--black);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card:hover::after {
    transform: scaleX(1);
}

.card-title {
    font-size: var(--text-2xl);
    font-weight: 400;
    margin-bottom: var(--space-md);
    letter-spacing: 1px;
}

.card-subtitle {
    font-size: var(--text-sm);
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
}

.card-content {
    font-size: var(--text-base);
    line-height: 1.8;
    color: var(--gray-300);
}

.card-footer {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: var(--border-thin) solid var(--gray-950);
}

/* Card Variants */
.card-filled {
    background: var(--black);
    color: var(--white);
}

.card-filled .card-content {
    color: var(--gray-800);
}

.card-minimal {
    border: none;
    padding: 0;
}

.card-minimal:hover {
    transform: none;
    box-shadow: none;
}

/* ==========================================
   DIVIDERS
   ========================================== */

.divider-horizontal {
    width: 100%;
    height: var(--border-thin);
    background: var(--black);
    margin: var(--space-lg) 0;
    border: none;
}

.divider-vertical {
    width: var(--border-thin);
    height: 100%;
    background: var(--black);
    margin: 0 var(--space-lg);
}

.divider-decorative {
    width: 80px;
    height: var(--border-medium);
    background: var(--black);
    margin: var(--space-xl) auto;
    border: none;
}

.divider-gradient {
    height: var(--border-thin);
    background: linear-gradient(to right, transparent, var(--black), transparent);
    margin: var(--space-lg) 0;
    border: none;
}

/* ==========================================
   HEADER & NAVIGATION
   ========================================== */

.site-header {
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: var(--z-header);
    background: var(--white-90);
    border-bottom: var(--border-thin) solid var(--black);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
}

.site-header.hidden {
    transform: translateY(-100%);
}

.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
    position: relative;
}

/* Logo */
.nav-logo {
    font-size: var(--text-xl);
    font-weight: 700;
    text-decoration: none;
    color: var(--black);
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    transition: opacity var(--transition-base);
}

.nav-logo:hover {
    opacity: 0.7;
}

/* Yin-Yang Icon for Logo */
.nav-logo::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    background: radial-gradient(circle at 30% 30%, var(--white) 0%, var(--white) 40%, var(--black) 40%, var(--black) 100%);
    border-radius: 50%;
    border: 2px solid var(--black);
}

/* Navigation Links */
.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
    align-items: center;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--black);
    position: relative;
    padding-bottom: 3px;
    font-size: var(--text-sm);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    transition: opacity var(--transition-base);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: var(--border-thin);
    background: var(--black);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover {
    opacity: 0.7;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    z-index: var(--z-header);
}

.hamburger {
    display: block;
    width: 28px;
    height: 2px;
    background: var(--black);
    position: relative;
    transition: background var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 28px;
    height: 2px;
    background: var(--black);
    transition: transform var(--transition-base);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-toggle.active .hamburger {
    background: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
    transform: rotate(45deg) translateY(8px);
}

.mobile-menu-toggle.active .hamburger::after {
    transform: rotate(-45deg) translateY(-8px);
}

/* ==========================================
   SECTIONS
   ========================================== */

.section {
    padding: var(--space-xxl) 0;
    position: relative;
}

.section-alt {
    background: var(--light-gray);
}

.section-dark {
    background: var(--black);
    color: var(--white);
}

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

.section-header h2 {
    position: relative;
    padding-bottom: var(--space-lg);
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 1px;
    background: var(--black);
}

.section-dark .section-header h2::after {
    background: var(--white);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--gray-500);
    margin-top: var(--space-sm);
}

/* ==========================================
   YIN-YANG (defined in pages/home.css)
   ========================================== */

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

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

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

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

.grid-auto {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

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

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

.form-label {
    display: block;
    margin-bottom: var(--space-xs);
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    border: var(--border-thin) solid var(--black);
    background: var(--white);
    font-family: var(--font-body);
    font-size: var(--text-base);
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--gray-500);
    box-shadow: 0 0 0 3px var(--black-10);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-checkbox,
.form-radio {
    margin-right: var(--space-xs);
}

/* ==========================================
   TABLES
   ========================================== */

.table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
}

.table th,
.table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: var(--border-thin) solid var(--gray-950);
}

.table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: var(--text-sm);
    letter-spacing: 1px;
    background: var(--light-gray);
}

.table tr:hover {
    background: var(--light-gray);
}

/* ==========================================
   BADGES & TAGS
   ========================================== */

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: var(--border-thin) solid var(--black);
    background: var(--white);
    color: var(--black);
}

.badge-filled {
    background: var(--black);
    color: var(--white);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: var(--text-xs);
    background: var(--light-gray);
    color: var(--black);
    margin-right: var(--space-xs);
    margin-bottom: var(--space-xs);
}

/* ==========================================
   MODAL & OVERLAY
   ========================================== */

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--black-70);
    z-index: var(--z-overlay);
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.overlay.active {
    display: flex;
    opacity: 1;
}

.modal {
    background: var(--white);
    padding: var(--space-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.overlay.active .modal {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    background: none;
    border: none;
    font-size: var(--text-3xl);
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base);
}

.modal-close:hover {
    transform: rotate(90deg);
}

/* ==========================================
   FOOTER
   ========================================== */

.site-footer {
    background: var(--black);
    color: var(--white);
    padding: var(--space-xxl) 0 var(--space-lg);
    border-top: var(--border-thin) solid var(--black);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-section h3 {
    font-size: var(--text-lg);
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section ul li {
    margin-bottom: var(--space-xs);
}

.footer-section a {
    color: var(--gray-700);
    transition: color var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    border-top: var(--border-thin) solid var(--gray-300);
    color: var(--gray-600);
    font-size: var(--text-sm);
}

/* ==========================================
   RESPONSIVE BREAKPOINTS
   ========================================== */

@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        transition: right var(--transition-base);
        box-shadow: var(--shadow-2xl);
        z-index: calc(var(--z-header) - 1);
    }

    .nav-links.active {
        right: 0;
    }

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

    .grid-2,
    .grid-3,
    .grid-4,
    .grid-auto {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--space-xl) 0;
    }
}

@media (max-width: 480px) {
    .card {
        padding: var(--space-md);
    }

    .modal {
        padding: var(--space-lg);
        width: 95%;
    }

    .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--text-xs);
    }
}