/* =========================================
   VERTRAUEN — Precision Aerial Systems
   ========================================= */

:root {
    /* Core Palette */
    --black: #0a0a0b;
    --charcoal: #111113;
    --dark: #17171a;
    --steel: #1e1e22;
    --iron: #2a2a30;
    --ash: #3a3a42;
    --slate: #6b6b78;
    --silver: #9a9aaa;
    --light: #c8c8d4;
    --white: #eaeaf0;
    --pure: #f5f5f8;

    /* Accent — Tactical Amber */
    --amber: #c9a227;
    --amber-light: #dbb938;
    --amber-dim: #8a6e1a;
    --amber-glow: rgba(201, 162, 39, 0.12);
    --amber-glow-strong: rgba(201, 162, 39, 0.25);

    /* Functional */
    --red: #c94432;

    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-body: 'DM Sans', system-ui, sans-serif;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-2xl: 10rem;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

    /* Layout */
    --container: min(1280px, 90vw);
    --nav-height: 72px;
}

/* ── Reset ── */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scrollbar-width: thin;
    scrollbar-color: var(--iron) var(--charcoal);
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--light);
    background-color: var(--black);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

a {
    color: inherit;
    text-decoration: none;
}

ul { list-style: none; }

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

button, input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
    outline: none;
}

::selection {
    background: var(--amber);
    color: var(--black);
}

/* ── Topographic Canvas ── */

#topo-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.06;
}

/* ── Reveal Animations ── */

.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}

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

.reveal--d1 { transition-delay: 0.1s; }
.reveal--d2 { transition-delay: 0.2s; }
.reveal--d3 { transition-delay: 0.3s; }
.reveal--d4 { transition-delay: 0.4s; }
.reveal--d5 { transition-delay: 0.5s; }

/* ── Navigation ── */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-height);
    transition: background 0.4s ease, border-color 0.4s ease, backdrop-filter 0.4s ease;
    border-bottom: 1px solid transparent;
}

.nav--scrolled {
    background: rgba(10, 10, 11, 0.85);
    backdrop-filter: blur(24px) saturate(1.2);
    -webkit-backdrop-filter: blur(24px) saturate(1.2);
    border-bottom-color: var(--iron);
}

.nav__inner {
    max-width: var(--container);
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-md);
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 10;
}

.nav__logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1.5px solid var(--amber);
    color: var(--amber);
    font-family: var(--font-display);
    font-size: 18px;
    letter-spacing: 0;
    transform: rotate(45deg);
}

.nav__logo-mark > * {
    transform: rotate(-45deg);
}

.nav__logo-text {
    font-weight: 400;
    font-size: 13px;
    letter-spacing: 0.3em;
    color: var(--white);
}

.nav__links {
    display: flex;
    gap: var(--space-lg);
}

.nav__link {
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 0.06em;
    color: var(--silver);
    transition: color 0.3s ease;
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--amber);
    transition: width 0.4s var(--ease-out);
}

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

.nav__link:hover::after {
    width: 100%;
}

.nav__cta {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--amber);
    border: 1px solid var(--amber-dim);
    padding: 10px 24px;
    transition: all 0.3s ease;
}

.nav__cta:hover {
    background: var(--amber);
    color: var(--black);
}

.nav__mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 10;
    padding: 4px;
}

.nav__mobile-toggle span {
    display: block;
    width: 24px;
    height: 1.5px;
    background: var(--white);
    transition: all 0.3s ease;
}

.nav__mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--black);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    z-index: 5;
}

.nav__mobile-menu.active {
    display: flex;
}

.nav__mobile-link {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--light);
    transition: color 0.3s ease;
}

.nav__mobile-link:hover {
    color: var(--amber);
}

.nav__mobile-link--cta {
    font-family: var(--font-body);
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    border: 1px solid var(--amber-dim);
    padding: 12px 32px;
    margin-top: var(--space-md);
    color: var(--amber);
}

/* ── Hero ── */

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 1;
    padding: calc(var(--nav-height) + var(--space-lg)) var(--space-md) var(--space-lg);
    max-width: var(--container);
    margin: 0 auto;
}

.hero__content {
    max-width: 800px;
}

.hero__label {
    display: inline-flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: var(--space-md);
}

.hero__label-line {
    display: block;
    width: 48px;
    height: 1px;
    background: var(--amber-dim);
}

.hero__title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(3.2rem, 8vw, 7rem);
    line-height: 1.05;
    color: var(--pure);
    margin-bottom: var(--space-md);
}

.hero__title em {
    font-style: italic;
    color: var(--amber);
}

.hero__title span {
    display: block;
}

.hero__subtitle {
    font-size: clamp(1rem, 1.8vw, 1.2rem);
    line-height: 1.7;
    color: var(--silver);
    max-width: 580px;
    margin-bottom: var(--space-lg);
}

.hero__actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.hero__grid {
    display: flex;
    gap: var(--space-xl);
    margin-top: auto;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--iron);
}

.hero__stat {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.hero__stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--pure);
}

.hero__stat-label {
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate);
}

.hero__scroll-indicator {
    position: absolute;
    bottom: var(--space-md);
    right: var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero__scroll-line {
    width: 1px;
    height: 64px;
    background: linear-gradient(to bottom, var(--amber), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); transform-origin: top; }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ── Buttons ── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 14px 32px;
    transition: all 0.35s var(--ease-out);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--amber);
    color: var(--black);
    border: 1px solid var(--amber);
}

.btn--primary:hover {
    background: var(--amber-light);
    border-color: var(--amber-light);
    transform: translateY(-1px);
    box-shadow: 0 8px 32px rgba(201, 162, 39, 0.2);
}

.btn--ghost {
    color: var(--light);
    border: 1px solid var(--iron);
}

.btn--ghost:hover {
    border-color: var(--amber-dim);
    color: var(--amber);
    transform: translateY(-1px);
}

.btn--full {
    width: 100%;
    justify-content: center;
}

/* ── Section Headers ── */

.section__number {
    display: inline-block;
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.2em;
    color: var(--amber);
    margin-bottom: var(--space-sm);
    padding: 6px 16px;
    border: 1px solid var(--amber-dim);
}

.section__title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(2.4rem, 5vw, 4rem);
    line-height: 1.1;
    color: var(--pure);
    margin-bottom: var(--space-sm);
}

.section__title em {
    font-style: italic;
    color: var(--amber);
}

.section__subtitle {
    font-size: 1.05rem;
    color: var(--silver);
    max-width: 520px;
    line-height: 1.7;
}

/* ── Solutions ── */

.solutions {
    position: relative;
    z-index: 1;
    padding: var(--space-2xl) var(--space-md);
    max-width: var(--container);
    margin: 0 auto;
}

.solutions__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    margin-top: var(--space-xl);
}

.solution-card {
    background: var(--charcoal);
    border: 1px solid var(--iron);
    padding: var(--space-lg);
    position: relative;
    transition: all 0.5s var(--ease-out);
    overflow: hidden;
}

.solution-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--amber);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s var(--ease-out);
}

.solution-card:hover {
    background: var(--dark);
    border-color: var(--ash);
    transform: translateY(-4px);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
}

.solution-card:hover::before {
    transform: scaleX(1);
}

.solution-card__icon {
    width: 48px;
    height: 48px;
    color: var(--amber);
    margin-bottom: var(--space-md);
}

.solution-card__number {
    font-size: 11px;
    letter-spacing: 0.15em;
    color: var(--ash);
    margin-bottom: var(--space-sm);
}

.solution-card__title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 1.8rem;
    line-height: 1.15;
    color: var(--pure);
    margin-bottom: var(--space-sm);
}

.solution-card__desc {
    font-size: 0.95rem;
    color: var(--silver);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.solution-card__features {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.solution-card__features li {
    font-size: 13px;
    color: var(--slate);
    padding-left: 18px;
    position: relative;
    transition: color 0.3s ease;
}

.solution-card__features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 7px;
    width: 6px;
    height: 6px;
    border: 1px solid var(--amber-dim);
    transform: rotate(45deg);
    transition: background 0.3s ease;
}

.solution-card:hover .solution-card__features li {
    color: var(--silver);
}

.solution-card:hover .solution-card__features li::before {
    background: var(--amber);
    border-color: var(--amber);
}

.solution-card__line {
    position: absolute;
    bottom: 0;
    left: var(--space-lg);
    right: var(--space-lg);
    height: 1px;
    background: var(--iron);
}

/* ── Capabilities Marquee ── */

.capabilities {
    position: relative;
    z-index: 1;
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--iron);
    border-bottom: 1px solid var(--iron);
    overflow: hidden;
}

.capabilities__track {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    animation: marquee 30s linear infinite;
    width: max-content;
}

.capabilities__track span {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    color: var(--ash);
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.capabilities__dot {
    width: 6px !important;
    height: 6px;
    min-width: 6px;
    background: var(--amber-dim);
    transform: rotate(45deg);
    font-size: 0 !important;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ── About ── */

.about {
    position: relative;
    z-index: 1;
    padding: var(--space-2xl) var(--space-md);
    max-width: var(--container);
    margin: 0 auto;
}

.about__grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
    align-items: start;
}

.about__lead {
    font-family: var(--font-display);
    font-size: 1.6rem;
    line-height: 1.5;
    color: var(--pure);
    margin-bottom: var(--space-md);
}

.about__lead strong {
    color: var(--amber);
    font-weight: 400;
}

.about__text p {
    color: var(--silver);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.about__values {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.value-card {
    background: var(--charcoal);
    border: 1px solid var(--iron);
    padding: var(--space-md);
    transition: all 0.4s var(--ease-out);
}

.value-card:hover {
    border-color: var(--amber-dim);
    background: var(--dark);
}

.value-card__number {
    font-size: 11px;
    letter-spacing: 0.15em;
    color: var(--amber-dim);
    display: block;
    margin-bottom: var(--space-xs);
}

.value-card__title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--pure);
    margin-bottom: 8px;
    font-weight: 400;
}

.value-card__desc {
    font-size: 0.9rem;
    color: var(--slate);
    line-height: 1.6;
}

/* ── Contact ── */

.contact {
    position: relative;
    z-index: 1;
    padding: var(--space-2xl) var(--space-md);
    max-width: var(--container);
    margin: 0 auto;
}

.contact__grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
    align-items: start;
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

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

.form__group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form__label {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate);
}

.form__input {
    background: var(--charcoal);
    border: 1px solid var(--iron);
    padding: 14px 16px;
    color: var(--pure);
    font-size: 0.95rem;
    font-weight: 300;
    transition: all 0.3s ease;
    -webkit-appearance: none;
}

.form__input:focus {
    border-color: var(--amber-dim);
    box-shadow: 0 0 0 3px var(--amber-glow);
}

.form__input::placeholder {
    color: var(--ash);
}

.form__select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%236b6b78' stroke-width='1.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

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

.contact__info {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    padding-top: var(--space-md);
}

.contact__info-block {
    border-left: 2px solid var(--iron);
    padding-left: var(--space-sm);
}

.contact__info-label {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate);
    margin-bottom: 6px;
}

.contact__info-value {
    font-size: 1rem;
    color: var(--light);
    transition: color 0.3s ease;
}

a.contact__info-value:hover {
    color: var(--amber);
}

.contact__security-note {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 12px;
    color: var(--ash);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--iron);
}

.contact__security-note svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: var(--amber-dim);
}

/* ── Footer ── */

.footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--iron);
    padding: var(--space-xl) var(--space-md) var(--space-md);
    background: var(--charcoal);
}

.footer__inner {
    max-width: var(--container);
    margin: 0 auto;
}

.footer__top {
    display: flex;
    justify-content: space-between;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--iron);
}

.footer__tagline {
    font-size: 0.9rem;
    color: var(--slate);
    line-height: 1.6;
    margin-top: var(--space-sm);
}

.footer__nav {
    display: flex;
    gap: var(--space-xl);
}

.footer__col {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer__col-title {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--slate);
    margin-bottom: 4px;
}

.footer__col a {
    font-size: 0.9rem;
    color: var(--silver);
    transition: color 0.3s ease;
}

.footer__col a:hover {
    color: var(--amber);
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-md);
    font-size: 12px;
    color: var(--ash);
}

.footer__legal {
    display: flex;
    gap: var(--space-md);
}

.footer__legal a {
    color: var(--ash);
    transition: color 0.3s ease;
}

.footer__legal a:hover {
    color: var(--silver);
}

/* ── Responsive ── */

@media (max-width: 1024px) {
    .solutions__grid {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .about__grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .contact__grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

@media (max-width: 768px) {
    :root {
        --space-2xl: 6rem;
    }

    .nav__links,
    .nav__cta {
        display: none;
    }

    .nav__mobile-toggle {
        display: flex;
    }

    .hero__grid {
        gap: var(--space-lg);
        flex-wrap: wrap;
    }

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

    .footer__top {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .footer__bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space-2xl: 4rem;
        --space-xl: 3rem;
        --space-lg: 2rem;
    }

    .hero__title {
        font-size: 2.6rem;
    }

    .solution-card {
        padding: var(--space-md);
    }
}

/* ── Form submission state ── */

.form--submitted .btn--primary {
    background: #2a6e3f;
    border-color: #2a6e3f;
    pointer-events: none;
}

.form--submitted .btn--primary span {
    display: inline;
}