/* ═══════════════════════════════════════════════════════════════════════════
   www / site.css
   Full design system for the public-facing website.
   No inline styles — all visual rules live here.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── 1. Fonts ─────────────────────────────────────────────────────────────── */

@font-face {
    font-family: 'Inter';
    src: url('../fonts/inter/inter-latin-400-normal.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../fonts/inter/inter-latin-500-normal.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../fonts/inter/inter-latin-600-normal.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Inter';
    src: url('../fonts/inter/inter-latin-700-normal.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* ── 2. Design tokens (default: blue) ─────────────────────────────────────── */

:root {
    --color-primary:     #2563eb;
    --color-primary-dk:  #1d4ed8;
    --color-primary-lt:  #dbeafe;
    --color-primary-rgb: 37, 99, 235;

    --color-bg:          #0f172a;
    --color-bg-2:        #1e293b;
    --color-bg-3:        #334155;
    --color-surface:     #1e293b;
    --color-border:      rgba(255,255,255,.08);

    --color-text:        #f1f5f9;
    --color-text-muted:  #94a3b8;
    --color-text-on-primary: #ffffff;

    --radius-sm:   .375rem;
    --radius-md:   .75rem;
    --radius-lg:   1.25rem;
    --radius-full: 9999px;

    --shadow-sm:  0 1px  3px rgba(0,0,0,.25);
    --shadow-md:  0 4px 16px rgba(0,0,0,.35);
    --shadow-lg:  0 8px 32px rgba(0,0,0,.45);

    --nav-h: 64px;
    --section-gap: 6rem;

    --transition: 200ms ease;
}

/* ── 3. Theme overrides ───────────────────────────────────────────────────── */

[data-theme="blue"] {
    --color-primary:     #2563eb;
    --color-primary-dk:  #1d4ed8;
    --color-primary-lt:  #dbeafe;
    --color-primary-rgb: 37, 99, 235;
}

[data-theme="green"] {
    --color-primary:     #16a34a;
    --color-primary-dk:  #15803d;
    --color-primary-lt:  #dcfce7;
    --color-primary-rgb: 22, 163, 74;
}

[data-theme="purple"] {
    --color-primary:     #7c3aed;
    --color-primary-dk:  #6d28d9;
    --color-primary-lt:  #ede9fe;
    --color-primary-rgb: 124, 58, 237;
}

[data-theme="orange"] {
    --color-primary:     #ea580c;
    --color-primary-dk:  #c2410c;
    --color-primary-lt:  #ffedd5;
    --color-primary-rgb: 234, 88, 12;
}

[data-theme="slate"] {
    --color-primary:     #475569;
    --color-primary-dk:  #334155;
    --color-primary-lt:  #f1f5f9;
    --color-primary-rgb: 71, 85, 105;
}

/* ── 4. Reset & base ──────────────────────────────────────────────────────── */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

img, svg {
    display: block;
    max-width: 100%;
}

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

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

ul { list-style: none; }

/* ── 5. Buttons ───────────────────────────────────────────────────────────── */

.btn-primary,
.btn-ghost {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .75rem 1.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: .95rem;
    cursor: pointer;
    transition: background var(--transition), color var(--transition),
                box-shadow var(--transition), transform var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-on-primary);
    box-shadow: 0 0 0 0 rgba(var(--color-primary-rgb), .4);
}

.btn-primary:hover {
    background: var(--color-primary-dk);
    color: var(--color-text-on-primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--color-primary-rgb), .45);
}

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

.btn-ghost:hover {
    background: var(--color-bg-2);
    color: var(--color-text);
    border-color: var(--color-bg-3);
    transform: translateY(-2px);
}

/* ── 6. Navbar ────────────────────────────────────────────────────────────── */

.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-h);
    background: rgba(15, 23, 42, .85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition), box-shadow var(--transition);
}

.site-nav.is-scrolled {
    background: rgba(15, 23, 42, .97);
    box-shadow: var(--shadow-md);
}

.site-nav__inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.site-nav__brand {
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--color-text);
    letter-spacing: -.02em;
    flex-shrink: 0;
}

.site-nav__brand:hover {
    color: var(--color-primary);
}

.site-nav__menu {
    display: flex;
    align-items: center;
    gap: 0;
    margin-left: auto;
}

.site-nav__menu li a {
    display: block;
    padding: .5rem 1rem;
    color: var(--color-text-muted);
    font-size: .9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
}

.site-nav__menu li a:hover {
    color: var(--color-text);
    background: var(--color-bg-2);
}

/* Hamburger */
.site-nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: .5rem;
    margin-left: auto;
    border-radius: var(--radius-sm);
}

.site-nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.site-nav__toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── 7. Sections — shared ─────────────────────────────────────────────────── */

.section-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--section-gap) 1.5rem;
}

.section-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -.03em;
    color: var(--color-text);
    margin-bottom: .75rem;
}

.section-sub {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    margin-bottom: 3rem;
}

/* ── 8. Hero ──────────────────────────────────────────────────────────────── */

.hero {
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: var(--nav-h);
    background:
        radial-gradient(ellipse 80% 60% at 50% -10%,
            rgba(var(--color-primary-rgb), .18) 0%,
            transparent 70%),
        var(--color-bg);
}

.hero__inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .35rem 1rem;
    border-radius: var(--radius-full);
    background: rgba(var(--color-primary-rgb), .12);
    border: 1px solid rgba(var(--color-primary-rgb), .25);
    color: var(--color-primary);
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    margin-bottom: 1.75rem;
}

.hero__badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--color-primary);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50%       { opacity: .35; }
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    letter-spacing: -.04em;
    line-height: 1.1;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.hero__desc {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-muted);
    max-width: 560px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.hero__cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero__scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--color-text-muted);
    animation: bounce 2.5s infinite;
    opacity: .6;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%       { transform: translateX(-50%) translateY(6px); }
}

/* ── 9. Features ──────────────────────────────────────────────────────────── */

.features {
    background: var(--color-bg-2);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem 1.75rem;
    transition: border-color var(--transition), box-shadow var(--transition),
                transform var(--transition);
}

.feature-card:hover {
    border-color: rgba(var(--color-primary-rgb), .4);
    box-shadow: 0 0 0 1px rgba(var(--color-primary-rgb), .15),
                var(--shadow-md);
    transform: translateY(-4px);
}

.feature-card__icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: rgba(var(--color-primary-rgb), .12);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    padding: .75rem;
}

.feature-card__icon img {
    filter: invert(1) brightness(2) sepia(1) hue-rotate(180deg) saturate(3);
}

.feature-card__title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: .6rem;
}

.feature-card__text {
    font-size: .92rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ── 10. About ────────────────────────────────────────────────────────────── */

.about__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about__text p {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    line-height: 1.8;
    margin-top: 1rem;
}

.about__decoration {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about__shape {
    width: 280px;
    height: 280px;
    border-radius: 40% 60% 55% 45% / 50% 45% 55% 50%;
    background: linear-gradient(
        135deg,
        rgba(var(--color-primary-rgb), .25),
        rgba(var(--color-primary-rgb), .05)
    );
    border: 1px solid rgba(var(--color-primary-rgb), .2);
    animation: morph 10s ease-in-out infinite;
}

@keyframes morph {
    0%, 100% { border-radius: 40% 60% 55% 45% / 50% 45% 55% 50%; }
    33%       { border-radius: 60% 40% 45% 55% / 45% 55% 45% 55%; }
    66%       { border-radius: 50% 50% 60% 40% / 55% 45% 55% 45%; }
}

/* ── 11. Contact ──────────────────────────────────────────────────────────── */

.contact {
    background: var(--color-bg-2);
    border-top: 1px solid var(--color-border);
}

.contact-success {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: 1rem 1.5rem;
    background: rgba(22, 163, 74, .12);
    border: 1px solid rgba(22, 163, 74, .3);
    border-radius: var(--radius-md);
    color: #4ade80;
    font-weight: 500;
    margin-bottom: 2rem;
}

.contact-form {
    max-width: 700px;
}

.contact-form__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.contact-form__col--full {
    grid-column: 1 / -1;
}

/* Field labels & inputs */
.field-label {
    display: block;
    font-size: .85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: .4rem;
    letter-spacing: .02em;
    text-transform: uppercase;
}

.field-input {
    display: block;
    width: 100%;
    padding: .75rem 1rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: inherit;
    font-size: .95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.field-input::placeholder {
    color: var(--color-bg-3);
}

.field-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), .2);
}

.field-input--textarea {
    resize: vertical;
    min-height: 140px;
}

/* Yii2 validation states */
.has-error .field-input {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, .15);
}

.field-error {
    display: block;
    margin-top: .35rem;
    font-size: .82rem;
    color: #f87171;
}

.contact-form__footer {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: .5rem;
}

/* Submit button spinner */
.btn-submit {
    position: relative;
    padding-right: 2.5rem;
}

.btn-submit__spinner {
    display: none;
    position: absolute;
    right: .9rem;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}

.btn-submit.is-loading .btn-submit__spinner {
    display: block;
}

@keyframes spin {
    to { transform: translateY(-50%) rotate(360deg); }
}

/* ── 12. Footer ───────────────────────────────────────────────────────────── */

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
}

.site-footer__inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.site-footer__copy {
    font-size: .85rem;
    color: var(--color-text-muted);
}

.site-footer__links {
    display: flex;
    gap: 1.5rem;
}

.site-footer__links a {
    font-size: .85rem;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.site-footer__links a:hover {
    color: var(--color-text);
}

/* ── 13. Responsive ───────────────────────────────────────────────────────── */

@media (max-width: 900px) {
    .features__grid {
        grid-template-columns: 1fr 1fr;
    }

    .about__inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about__decoration {
        display: none;
    }
}

@media (max-width: 640px) {
    :root { --section-gap: 4rem; }

    .site-nav__toggle {
        display: flex;
    }

    .site-nav__menu {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        position: absolute;
        top: var(--nav-h);
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 1rem 1.5rem;
        gap: .25rem;
    }

    .site-nav__menu.is-open {
        display: flex;
    }

    .site-nav__menu li {
        width: 100%;
    }

    .site-nav__menu li a {
        padding: .65rem 0;
        font-size: 1rem;
    }

    .features__grid {
        grid-template-columns: 1fr;
    }

    .contact-form__grid {
        grid-template-columns: 1fr;
    }

    .contact-form__col--full {
        grid-column: 1;
    }

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

/* ── 14. Focus visible ─────────────────────────────────────────────────────── */

:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

/* ── 15. Reduced motion ────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }

    html { scroll-behavior: auto; }
}
/* ── 16. Error page ─────────────────────────────────────────────────────────── */

.error-section {
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.error-section__inner {
    text-align: center;
    padding: var(--section-padding) 0;
}

.error-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--color-danger, #e74c3c) 12%, transparent);
    color: var(--color-danger, #e74c3c);
    margin: 0 auto 1.5rem;
}

.error-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.error-message {
    font-size: 1.05rem;
    color: var(--color-danger, #e74c3c);
    margin-bottom: 1.25rem;
    font-weight: 500;
}

.error-hint {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.error-hint a {
    color: var(--color-primary);
    text-decoration: underline;
}