/* Technical Target Solutions - main stylesheet
   No build step, no external framework. System font stack only. */

:root {
    --color-navy: #0b1e39;
    --color-navy-light: #14294b;
    --color-charcoal: #2b2f36;
    --color-charcoal-soft: #565c66;
    --color-white: #ffffff;
    --color-bg-alt: #f4f6f9;
    --color-border: #dfe3ea;
    --color-accent: #2e7d8c;
    --color-accent-dark: #205964;
    --color-warning-bg: #fdf3e3;
    --color-warning-border: #e8c477;
    --color-warning-text: #6b4a05;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 1120px;
    --radius: 6px;
    --shadow-sm: 0 1px 3px rgba(11, 30, 57, 0.08);
    --shadow-md: 0 6px 20px rgba(11, 30, 57, 0.10);
}

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

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    color: var(--color-charcoal);
    background: var(--color-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
    color: var(--color-navy);
    line-height: 1.2;
    font-weight: 700;
    margin: 0 0 0.6em;
}

h1 { font-size: clamp(1.9rem, 3vw + 1rem, 2.75rem); }
h2 { font-size: clamp(1.5rem, 2vw + 1rem, 2.1rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1em; }

a {
    color: var(--color-accent-dark);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

.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;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -3rem;
    background: var(--color-navy);
    color: var(--color-white);
    padding: 0.6rem 1rem;
    border-radius: var(--radius);
    z-index: 1000;
    transition: top 0.15s ease;
    text-decoration: none;
}

.skip-link:focus {
    top: 1rem;
}

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn--primary:hover {
    background: var(--color-accent-dark);
    color: var(--color-white);
}

.btn--secondary {
    background: transparent;
    border-color: var(--color-white);
    color: var(--color-white);
}

.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--color-white);
}

.btn--outline {
    background: transparent;
    border-color: var(--color-accent);
    color: var(--color-accent-dark);
}

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

.btn[disabled], .btn--disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

/* Header */
.site-header {
    background: var(--color-navy);
    color: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.9rem 1.25rem;
}

.site-logo {
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.15rem;
    text-decoration: none;
    letter-spacing: 0.01em;
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Desktop nav */
.site-nav__list {
    list-style: none;
    display: flex;
    gap: 1.25rem;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.site-nav__link {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 0.95rem;
    padding: 0.4rem 0.1rem;
    border-bottom: 2px solid transparent;
}

.site-nav__link:hover,
.site-nav__link.is-active {
    color: var(--color-white);
    border-bottom-color: var(--color-accent);
}

/* Language switcher (desktop) */
.lang-switch {
    display: flex;
    gap: 0.4rem;
    font-size: 0.85rem;
}

.lang-switch__link {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.lang-switch__link.is-active {
    background: rgba(255, 255, 255, 0.15);
    color: var(--color-white);
    font-weight: 600;
}

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

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: transparent;
    border: 0;
    padding: 0.5rem;
    cursor: pointer;
}

.mobile-menu-toggle__bar {
    width: 22px;
    height: 2px;
    background: var(--color-white);
    display: block;
}

.mobile-menu {
    background: var(--color-navy-light);
    color: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 99;
}

.mobile-menu[hidden] { display: none; }

.mobile-menu__inner {
    padding: 1rem 1.25rem 1.5rem;
    position: relative;
}

.mobile-menu__close {
    position: absolute;
    right: 1.25rem;
    top: 0.75rem;
    background: transparent;
    border: 0;
    color: var(--color-white);
    font-size: 1.6rem;
    line-height: 1;
    cursor: pointer;
}

.mobile-menu__list {
    list-style: none;
    margin: 2rem 0 1.5rem;
    padding: 0;
}

.mobile-menu__list li + li {
    margin-top: 0.75rem;
}

.mobile-menu__link {
    color: var(--color-white);
    text-decoration: none;
    font-size: 1.1rem;
}

.mobile-menu__link.is-active {
    color: var(--color-accent);
    font-weight: 600;
}

.mobile-menu__lang {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.mobile-menu__lang-label {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

@media (min-width: 900px) {
    .mobile-menu-toggle { display: none !important; }
    .mobile-menu { display: none !important; }
}

@media (max-width: 899.98px) {
    .site-nav { display: none; }
    .lang-switch--desktop { display: none; }
    .mobile-menu-toggle { display: inline-flex; }
}

/* Page banner */
.page-banner {
    background: var(--color-navy);
    color: var(--color-white);
    padding: 3rem 0;
}

.page-banner__title {
    color: var(--color-white);
    margin-bottom: 0.5rem;
}

.page-banner__subtitle {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
    max-width: 60ch;
    margin: 0;
}

/* Hero (home page) */
.hero {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-light) 100%);
    color: var(--color-white);
    padding: 4.5rem 0;
}

.hero__title {
    color: var(--color-white);
    max-width: 20ch;
}

.hero__subtext {
    color: rgba(255, 255, 255, 0.88);
    font-size: 1.15rem;
    max-width: 60ch;
}

.hero__actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

/* Generic section spacing */
.section {
    padding: 3.5rem 0;
}

.section--alt {
    background: var(--color-bg-alt);
}

.section__intro {
    max-width: 70ch;
    margin-bottom: 2rem;
}

/* Grids */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* Service cards */
.service-card {
    display: block;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
    height: 100%;
}

.service-card__index {
    display: inline-block;
    font-weight: 700;
    color: var(--color-accent);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.service-card__title {
    margin-bottom: 0.4rem;
    font-size: 1.1rem;
}

.service-card__summary {
    color: var(--color-charcoal-soft);
    margin: 0;
    font-size: 0.95rem;
}

/* Process steps */
.process-step {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.process-step__number {
    color: var(--color-accent);
    font-weight: 700;
    font-size: 0.9rem;
}

/* CTA section */
.cta-section {
    padding: 3rem 0;
}

.cta-section--default {
    background: var(--color-bg-alt);
}

.cta-section--inverted {
    background: var(--color-navy);
    color: var(--color-white);
}

.cta-section--inverted .cta-section__title {
    color: var(--color-white);
}

.cta-section--inverted .cta-section__body {
    color: rgba(255, 255, 255, 0.85);
}

.cta-section__inner {
    text-align: center;
    max-width: 70ch;
}

.cta-section__actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.25rem;
}

/* Alerts */
.alert {
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    margin: 1.5rem 0;
}

.alert--info {
    background: #eef5f6;
    border-color: #bfd9dd;
}

.alert--warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning-border);
    color: var(--color-warning-text);
}

.alert__badge {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-white);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    margin-bottom: 0.6rem;
}

.alert__title {
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.alert__body {
    margin: 0;
}

/* Demo / fictional content banner */
.demo-banner {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-warning-bg);
    border: 1px solid var(--color-warning-border);
    color: var(--color-warning-text);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Form preview (disabled state) */
.form-preview {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
}

.form-field {
    margin-bottom: 1.25rem;
}

.form-field__label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}

.form-field__input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    background: var(--color-bg-alt);
    color: var(--color-charcoal-soft);
}

.form-field__input--textarea {
    resize: vertical;
}

/* FAQ (native <details>) */
.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
}

.faq-item summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--color-navy);
    list-style: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::before {
    content: "+";
    display: inline-block;
    width: 1.2em;
    color: var(--color-accent);
    font-weight: 700;
}

.faq-item[open] summary::before {
    content: "\2212";
}

.faq-item p {
    margin-top: 0.75rem;
    color: var(--color-charcoal-soft);
}

/* Cookie settings disclosure */
.cookie-settings {
    display: inline-block;
}

.cookie-settings__link {
    cursor: pointer;
    list-style: none;
    text-decoration: underline;
}

.cookie-settings__link::-webkit-details-marker { display: none; }

.cookie-settings__panel {
    margin-top: 0.75rem;
    background: var(--color-white);
    color: var(--color-charcoal);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    max-width: 40ch;
    font-size: 0.85rem;
}

.cookie-settings__list {
    list-style: none;
    margin: 0.5rem 0;
    padding: 0;
}

.cookie-settings__list li {
    margin-bottom: 0.6rem;
}

.cookie-settings__list code {
    display: block;
    font-size: 0.8rem;
    color: var(--color-accent-dark);
}

/* Case studies */
.case-study {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.75rem;
}

.case-study h3 {
    margin-bottom: 0.25rem;
}

.case-study__section-title {
    font-weight: 700;
    color: var(--color-accent-dark);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    margin: 1rem 0 0.25rem;
}

/* Footer */
.site-footer {
    background: var(--color-charcoal);
    color: rgba(255, 255, 255, 0.85);
    padding: 3rem 0 1.5rem;
    margin-top: 3rem;
}

.site-footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.site-footer__brand {
    color: var(--color-white);
    font-weight: 700;
    font-size: 1.1rem;
}

.site-footer__heading {
    color: var(--color-white);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.9rem;
}

.site-footer__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-footer__list li {
    margin-bottom: 0.5rem;
}

.site-footer__list a {
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
}

.site-footer__list a:hover {
    color: var(--color-white);
}

.site-footer__bottom {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    font-size: 0.85rem;
}

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }