/* ============================================================
   110s Digital Studio — Phase 1 Front-End Foundation
   v1.0.0
   
   Design System:
   - Typography: SF Pro Display hierarchy (system -apple-system stack)
   - Palette: #ffffff bg, #212529 text, #f9ae00 accent
   - Philosophy: Minimal, premium, typography-driven
   ============================================================ */

/* ----------------------------------------------------------
   CSS Variables
   ---------------------------------------------------------- */
:root {
    --bg:           #ffffff;
    --text:         #212529;
    --text-light:   #6c757d;
    --accent:       #f9ae00;
    --accent-hover: #e09d00;
    --border:       #e9ecef;
    --nav-height:   80px;
    --nav-shrink:   64px;
    --transition:   0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display",
                    "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-body:    -apple-system, BlinkMacSystemFont, "SF Pro Text",
                    "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    overflow-x: hidden;
}

::selection {
    background: var(--accent);
    color: var(--text);
}

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

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

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

/* ----------------------------------------------------------
   Typography Hierarchy
   ---------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--text);
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
    font-family: var(--font-body);
    color: var(--text-light);
    font-weight: 300;
    line-height: 1.7;
}

.text-thin {
    font-weight: 200;
    letter-spacing: 0.01em;
}

.section-label {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1rem;
    display: inline-block;
}

/* ----------------------------------------------------------
   Buttons
   ---------------------------------------------------------- */
.btn-accent {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text);
    background-color: var(--accent);
    border: 2px solid var(--accent);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

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

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    font-family: var(--font-display);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text);
    background-color: transparent;
    border: 2px solid var(--text);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

/* ----------------------------------------------------------
   Navigation
   ---------------------------------------------------------- */
.ds-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1050;
    height: var(--nav-height);
    background: transparent;
    transition: all var(--transition);
    display: flex;
    align-items: center;
}

.ds-navbar.scrolled {
    height: var(--nav-shrink);
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.ds-navbar .navbar-brand {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
    transition: font-size var(--transition);
}

.ds-navbar.scrolled .navbar-brand {
    font-size: 1.1rem;
}

.ds-navbar .navbar-brand .brand-accent {
    color: var(--accent);
}

.ds-navbar .nav-link {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--text);
    padding: 0.5rem 1rem !important;
    position: relative;
    transition: color var(--transition);
}

.ds-navbar .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition);
}

.ds-navbar .nav-link:hover::after,
.ds-navbar .nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.ds-navbar .nav-link:hover,
.ds-navbar .nav-link.active {
    color: var(--accent);
}

.ds-navbar .btn-nav-cta {
    padding: 0.55rem 1.5rem;
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--text);
    background: var(--accent);
    border: 2px solid var(--accent);
    border-radius: 4px;
    transition: all var(--transition);
}

.ds-navbar .btn-nav-cta:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    transform: translateY(-1px);
}

/* Dropdown */
.ds-navbar .dropdown-menu {
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    display: block;
    pointer-events: none;
}

.ds-navbar .dropdown-menu.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.ds-navbar .dropdown-item {
    font-size: 0.8125rem;
    font-weight: 400;
    padding: 0.5rem 1.25rem;
    transition: background var(--transition), color var(--transition);
}

.ds-navbar .dropdown-item:hover {
    background: rgba(249, 174, 0, 0.08);
    color: var(--accent);
}

/* Hamburger */
.navbar-toggler {
    border: none;
    padding: 0.25rem;
    outline: none !important;
    box-shadow: none !important;
}

.navbar-toggler-icon {
    width: 24px;
    height: 24px;
}

/* Mobile nav */
@media (max-width: 991.98px) {
    .ds-navbar .navbar-collapse {
        background: var(--bg);
        padding: 1.5rem;
        border-radius: 0 0 8px 8px;
        border: 1px solid var(--border);
        border-top: none;
        margin-top: 0.5rem;
    }

    .ds-navbar .nav-link {
        padding: 0.75rem 0 !important;
        font-size: 0.9375rem;
    }

    .ds-navbar .nav-link::after {
        display: none;
    }

    .ds-navbar .btn-nav-cta {
        display: block;
        text-align: center;
        width: 100%;
        margin-top: 1rem;
        padding: 0.75rem;
    }

    .ds-navbar .dropdown-menu {
        border: none;
        box-shadow: none;
        padding-left: 1rem;
        opacity: 1;
        transform: none;
        pointer-events: all;
        display: none;
    }

    .ds-navbar .dropdown-menu.show {
        display: block;
    }
}

/* ----------------------------------------------------------
   Hero
   ---------------------------------------------------------- */
.ds-hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    position: relative;
    overflow: hidden;
}

.ds-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(249, 174, 0, 0.03) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 80%, rgba(249, 174, 0, 0.02) 0%, transparent 50%);
    pointer-events: none;
}

.ds-hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.ds-hero h1 {
    margin-bottom: 1.5rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s ease forwards;
}

.ds-hero .hero-sub {
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 200;
    color: var(--text-light);
    max-width: 560px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.15s ease forwards;
}

.ds-hero .hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.8s 0.3s ease forwards;
}

.ds-hero .hero-rule {
    width: 48px;
    height: 3px;
    background: var(--accent);
    border: none;
    margin: 0 auto 2rem;
    opacity: 0;
    animation: fadeUp 0.8s 0.1s ease forwards;
}

/* Scroll indicator */
.ds-hero .scroll-indicator {
    position: absolute;
    bottom: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    animation: fadeUp 0.8s 0.5s ease forwards;
}

.ds-hero .scroll-indicator span {
    display: block;
    width: 1px;
    height: 40px;
    background: var(--text-light);
    margin: 0 auto;
    opacity: 0.3;
    animation: scrollPulse 2s ease-in-out infinite;
}

/* ----------------------------------------------------------
   Services Preview
   ---------------------------------------------------------- */
.ds-services {
    padding: 7rem 0;
    background: var(--bg);
}

.ds-services .section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.ds-services .section-header h2 {
    margin-bottom: 1rem;
}

.ds-services .section-header p {
    max-width: 520px;
    margin: 0 auto;
    font-size: 1rem;
}

.ds-service-item {
    padding: 2.5rem 2rem;
    border: 1px solid transparent;
    border-radius: 6px;
    transition: all var(--transition);
    text-align: center;
    position: relative;
    cursor: default;
}

.ds-service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 40px;
    height: 2px;
    background: var(--accent);
    transition: transform var(--transition);
}

.ds-service-item:hover {
    border-color: var(--border);
    background: rgba(249, 174, 0, 0.015);
}

.ds-service-item:hover::before {
    transform: translateX(-50%) scaleX(1);
}

.ds-service-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--accent);
    font-size: 1.5rem;
    opacity: 0.85;
    transition: opacity var(--transition), transform var(--transition);
}

.ds-service-item:hover .ds-service-icon {
    opacity: 1;
    transform: translateY(-2px);
}

.ds-service-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.ds-service-item p {
    font-size: 0.875rem;
    line-height: 1.65;
    margin: 0;
}

/* ----------------------------------------------------------
   Footer
   ---------------------------------------------------------- */
.ds-footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border);
    background: var(--bg);
}

.ds-footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.ds-footer .footer-brand {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
}

.ds-footer .footer-brand .brand-accent {
    color: var(--accent);
}

.ds-footer-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.ds-footer-nav a {
    font-size: 0.8125rem;
    font-weight: 400;
    color: var(--text-light);
    transition: color var(--transition);
}

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

.ds-footer-social {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.ds-footer-social a {
    color: var(--text-light);
    font-size: 1rem;
    transition: color var(--transition), transform var(--transition);
}

.ds-footer-social a:hover {
    color: var(--accent);
    transform: translateY(-1px);
}

.ds-footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border);
}

.ds-footer-bottom p {
    font-size: 0.75rem;
    color: var(--text-light);
    margin: 0;
    font-weight: 300;
}

@media (max-width: 767.98px) {
    .ds-footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .ds-footer-nav {
        flex-wrap: wrap;
        justify-content: center;
    }
}

/* ----------------------------------------------------------
   Animations
   ---------------------------------------------------------- */
@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.15; transform: scaleY(0.6); transform-origin: top; }
    50%      { opacity: 0.4;  transform: scaleY(1);   transform-origin: top; }
}

/* Scroll reveal utility */
.ds-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.ds-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ----------------------------------------------------------
   Utility
   ---------------------------------------------------------- */
.gap-sm { gap: 0.75rem; }
.gap-md { gap: 1.5rem; }

/* Accent rule decorator */
.accent-rule {
    width: 40px;
    height: 3px;
    background: var(--accent);
    border: none;
    margin: 0;
}