/* ==========================================================================
   common.css - 공통 스타일
   LoveSwitch
   ========================================================================== */

/* ==========================================
   LAYOUT
========================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

.container-narrow {
    max-width: var(--container-narrow);
}

.container-wide {
    max-width: var(--container-wide);
}

section {
    padding: var(--space-24) 0;
    position: relative;
}

@media (max-width: 1024px) {
    section {
        padding: var(--space-16) 0;
    }
}

@media (max-width: 768px) {
    section {
        padding: var(--space-12) 0;
    }
}

.page-content {
    padding-top: var(--header-height);
}

/* ==========================================
   TEXT UTILITIES
========================================== */
.text-switch {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--pink-400);
}

.text-gradient {
    background: linear-gradient(135deg, var(--pink-400), var(--pink-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ==========================================
   ANIMATED BACKGROUND
========================================== */
.animated-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.animated-bg-gradient {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: floatGradient 15s ease-in-out infinite;
}

@keyframes floatGradient {
    0%, 100% { 
        transform: translate(0, 0) scale(1); 
    }
    25% { 
        transform: translate(30px, -30px) scale(1.1); 
    }
    50% { 
        transform: translate(-20px, 20px) scale(0.95); 
    }
    75% { 
        transform: translate(-30px, -20px) scale(1.05); 
    }
}

.bg-gradient-1 {
    width: 500px;
    height: 500px;
    top: -150px;
    right: -100px;
    background: radial-gradient(circle, var(--pink-600) 0%, transparent 70%);
    animation-delay: 0s;
}

.bg-gradient-2 {
    width: 400px;
    height: 400px;
    bottom: -100px;
    left: -100px;
    background: radial-gradient(circle, var(--pink-700) 0%, transparent 70%);
    animation-delay: -5s;
}

.bg-gradient-3 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 40%;
    background: radial-gradient(circle, rgba(244, 63, 94, 0.3) 0%, transparent 70%);
    animation-delay: -10s;
}

.bg-gradient-small {
    width: 200px;
    height: 200px;
    opacity: 0.3;
}

.bg-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
}

/* ==========================================
   GLASS MORPHISM
========================================== */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
}

.glass-strong {
    background: var(--bg-glass-strong);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--border-light);
}

.glass-card {
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.05) 0%,
        rgba(255, 255, 255, 0.02) 100%
    );
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.glass-card:hover {
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.08) 0%,
        rgba(255, 255, 255, 0.03) 100%
    );
    border-color: var(--border-pink);
    transform: translateY(-4px);
}

/* ==========================================
   BUTTONS
========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    line-height: 1;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn i {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    color: white;
    box-shadow: 0 4px 20px var(--pink-glow-soft);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--pink-400), var(--pink-500));
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--pink-glow);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: var(--bg-glass-strong);
    border-color: var(--pink-500);
    color: var(--pink-400);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: var(--space-2) var(--space-4);
}

.btn-ghost:hover {
    color: var(--pink-400);
}

.btn-lg {
    padding: var(--space-5) var(--space-10);
    font-size: 1rem;
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: 0.8125rem;
}

.btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: var(--radius-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ==========================================
   BADGES
========================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.badge-pink {
    background: var(--pink-glow-soft);
    color: var(--pink-400);
    border: 1px solid var(--border-pink);
}

.badge-success {
    background: var(--success-soft);
    color: var(--success);
}

.badge-warning {
    background: var(--warning-soft);
    color: var(--warning);
}

.badge-error {
    background: var(--error-soft);
    color: var(--error);
}

.badge-glass {
    background: var(--bg-glass);
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}

/* ==========================================
   FORM ELEMENTS
========================================== */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: var(--space-4);
    font-size: 0.9375rem;
    color: var(--text-primary);
    background: var(--bg-glass);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:focus {
    border-color: var(--pink-500);
    box-shadow: 0 0 0 3px var(--pink-glow-soft);
}

.form-input::placeholder {
    color: var(--text-dim);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23A1A1AA' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-4) center;
    padding-right: var(--space-10);
}

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

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
}

.form-checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--pink-500);
}

/* ==========================================
   SECTION COMMON
========================================== */
.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--pink-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.section-label::before,
.section-label::after {
    content: '';
    width: 20px;
    height: 1px;
    background: var(--pink-500);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-16);
}

.section-header p {
    margin-top: var(--space-4);
}

/* ==========================================
   ANIMATIONS
========================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

@keyframes pulse-glow {
    0%, 100% { 
        box-shadow: 0 0 20px var(--pink-glow-soft);
    }
    50% { 
        box-shadow: 0 0 40px var(--pink-glow);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-fade-in-up {
    opacity: 0;
    animation: fadeInUp 0.8s var(--ease-out) forwards;
}

.animate-fade-in {
    opacity: 0;
    animation: fadeIn 0.6s var(--ease-out) forwards;
}

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }
.animate-delay-5 { animation-delay: 0.5s; }

/* Scroll Animation Trigger */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s var(--ease-out);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================
   HEADER
========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(9, 9, 11, 0.95);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    max-width: var(--container-wide);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px var(--pink-glow-soft);
}

.logo-icon i {
    width: 22px;
    height: 22px;
    color: white;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.logo-text .text-switch {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--pink-500);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 450;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
    padding: var(--space-2) 0;
}

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

.nav-link.active {
    color: var(--pink-400);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--pink-500), var(--pink-400));
    border-radius: 1px;
    transition: width var(--transition-base);
}

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

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--space-2);
}

.mobile-menu-btn i {
    width: 24px;
    height: 24px;
}

@media (max-width: 1024px) {
    .nav-links {
        display: none;
    }
    
    .nav-actions .btn {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: calc(var(--z-fixed) - 1);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
}

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

.mobile-menu-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    font-size: 1rem;
    font-weight: 450;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.mobile-menu-link:hover,
.mobile-menu-link.active {
    background: var(--bg-glass);
    color: var(--pink-400);
}

.mobile-menu-link i {
    width: 20px;
    height: 20px;
}

.mobile-menu-divider {
    height: 1px;
    background: var(--border-subtle);
    margin: var(--space-4) 0;
}

.mobile-menu-actions {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* ==========================================
   FOOTER
========================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

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

@media (max-width: 600px) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.footer-brand {
    max-width: 300px;
}

@media (max-width: 600px) {
    .footer-brand {
        max-width: 100%;
        margin: 0 auto;
    }
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

@media (max-width: 600px) {
    .footer-logo {
        justify-content: center;
    }
}

.footer-logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-logo-icon i {
    width: 18px;
    height: 18px;
    color: white;
}

.footer-logo-text {
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-logo-text .text-switch {
    font-family: var(--font-display);
    font-style: italic;
    color: var(--pink-500);
}

.footer-description {
    font-size: 0.875rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-5);
}

.footer-social {
    display: flex;
    gap: var(--space-3);
}

@media (max-width: 600px) {
    .footer-social {
        justify-content: center;
    }
}

.footer-social-link {
    width: 40px;
    height: 40px;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.footer-social-link:hover {
    background: var(--pink-glow-soft);
    border-color: var(--border-pink);
}

.footer-social-link i {
    width: 18px;
    height: 18px;
    color: var(--text-secondary);
}

.footer-social-link:hover i {
    color: var(--pink-400);
}

.footer-column h5 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: var(--space-5);
    color: var(--text-primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-link {
    font-size: 0.875rem;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--pink-400);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-subtle);
    flex-wrap: wrap;
    gap: var(--space-4);
}

@media (max-width: 600px) {
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

.footer-copyright {
    font-size: 0.8125rem;
    color: var(--text-dim);
}

.footer-legal {
    display: flex;
    gap: var(--space-6);
}

.footer-legal a {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.footer-legal a:hover {
    color: var(--pink-400);
}

/* ==========================================
   MODAL
========================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-modal-backdrop);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    width: 100%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transform: scale(0.95) translateY(20px);
    transition: transform var(--transition-base);
    position: relative;
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--error-soft);
    border-color: var(--error);
    color: var(--error);
}

.modal-close i {
    width: 18px;
    height: 18px;
}

.modal-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-4);
    background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow-sm);
}

.modal-icon i {
    width: 32px;
    height: 32px;
    color: white;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.modal-subtitle {
    font-size: 0.9375rem;
    color: var(--text-muted);
}

/* ==========================================
   TOAST
========================================== */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    z-index: var(--z-toast);
}

@media (max-width: 480px) {
    .toast-container {
        left: var(--space-4);
        right: var(--space-4);
        bottom: var(--space-4);
    }
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: slideInRight 0.3s var(--ease-out);
}

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

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

.toast-success {
    border-left: 3px solid var(--success);
}

.toast-error {
    border-left: 3px solid var(--error);
}

.toast-warning {
    border-left: 3px solid var(--warning);
}

.toast-info {
    border-left: 3px solid var(--info);
}

.toast-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.toast-success .toast-icon { color: var(--success); }
.toast-error .toast-icon { color: var(--error); }
.toast-warning .toast-icon { color: var(--warning); }
.toast-info .toast-icon { color: var(--info); }

.toast-message {
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* ==========================================
   UTILITIES
========================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-center {
    justify-content: center;
}

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

.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.mt-auto { margin-top: auto; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.w-full { width: 100%; }

/* Loading Spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border-light);
    border-top-color: var(--pink-500);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-lg {
    width: 40px;
    height: 40px;
    border-width: 3px;
}