/* ==============================================
   Common — Layout, Header, Footer, Utilities
   ============================================== */

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


.section {
    padding: var(--space-4xl) 0;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-3xl);
}

.pc-only { display: inline; }
.mobile-only { display: none; }

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    transition: box-shadow var(--transition-base), background var(--transition-base);
}

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

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* Logo */
.nav-logo {
    font-family: var(--font-logo);
    font-size: 26px;
    letter-spacing: 0;
    color: var(--logo-color);
    -webkit-text-stroke: 0.4px var(--logo-color);
    transition: color var(--transition-base);
}

.nav-logo .to {
    color: var(--logo-to-color);
}

.nav-logo-tagline {
    display: inline-block;
    max-width: 0;
    overflow: hidden;
    white-space: nowrap;
    vertical-align: -5px;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 400;
    color: var(--text-secondary);
    -webkit-text-stroke: 0;
    transition: max-width 0.4s ease, margin-left 0.4s ease, opacity 0.3s ease;
    opacity: 0;
    margin-left: 0;
}

.nav-logo:hover .nav-logo-tagline {
    max-width: 280px;
    opacity: 1;
    margin-left: 12px;
}

/* Navigation */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-link {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    padding: var(--space-xs) var(--space-sm);
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: var(--space-sm);
    right: var(--space-sm);
    height: 2px;
    background: var(--accent);
    border-radius: 1px;
}



/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    gap: 5px;
}

.hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

/* Mobile Menu */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 999;
    padding: var(--space-xl);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-nav.open {
    opacity: 1;
    visibility: visible;
}

.mobile-nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.mobile-nav-link {
    display: block;
    padding: var(--space-md) 0;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    transition: color var(--transition-fast);
}

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

/* --- Footer --- */
.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: var(--space-lg) var(--space-3xl);
}

.footer-left {
    grid-column: 1;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-logo {
    font-family: var(--font-logo);
    font-size: 24px;
    letter-spacing: 0;
    color: var(--logo-color);
    -webkit-text-stroke: 0.4px var(--logo-color);
}

.footer-logo .to {
    color: var(--logo-to-color);
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

.footer-copyright {
    grid-column: 1;
    grid-row: 2;
    align-self: end;
    font-size: 12px;
    color: var(--text-tertiary);
}

.footer-right {
    grid-column: 2;
    grid-row: 1 / 3;
    display: flex;
    gap: var(--space-4xl);
}

.footer-col-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.footer-menu {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-menu a {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-menu a:hover {
    color: var(--accent);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.footer-contact a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer-contact a:hover {
    color: var(--accent);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.85rem 2rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* --- Floating Buttons --- */
.floating-buttons {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    z-index: 900;
}

.floating-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 18px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-fast);
}

.floating-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.phone-btn {
    background: var(--accent);
    color: var(--accent-text);
}

.top-btn {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-fast);
}

.top-btn.visible {
    opacity: 1;
    visibility: visible;
}

/* --- Scroll Animations --- */
.fade-in {
    opacity: 0.15;
    transform: translateY(16px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delay */
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* --- Cards Base --- */
.card {
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    transition: box-shadow var(--transition-base), transform var(--transition-fast);
}

.card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-2px);
}

/* --- Responsive --- */

/* Tablet */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--space-lg);
    }

    .section {
        padding: var(--space-2xl) 0;
    }

    .section-title {
        font-size: var(--font-size-2xl);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .nav-logo-tagline {
        display: none;
    }

    .pc-only { display: none; }
    .mobile-only { display: inline; }

    .container {
        padding: 0 var(--space-md);
    }

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

    .section-title {
        font-size: var(--font-size-xl);
    }

    .section-subtitle {
        font-size: var(--font-size-base);
    }

    p {
        text-wrap: auto;
    }

    /* Header */
    .nav-menu {
        display: none;
    }

    .header-right-mobile {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .mobile-nav {
        display: block;
    }

    /* Footer */
    .footer-inner {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: var(--space-lg);
        text-align: center;
    }

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

    .footer-copyright {
        order: 10;
        margin-top: var(--space-md);
        padding-top: var(--space-md);
        border-top: 1px solid var(--border-color);
        width: 100%;
    }

    .footer-right {
        flex-direction: column;
        align-items: center;
    }

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

    .footer-col:has(.footer-menu) {
        display: none;
    }

    .footer-col-title {
        display: none;
    }

    /* Floating */
    .floating-buttons {
        bottom: var(--space-md);
        right: var(--space-md);
    }

    .floating-btn {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }
}

/* Small */
@media (max-width: 480px) {
    .section-title {
        font-size: var(--font-size-lg);
    }
}