/* ============================================
   AvBrains — Rick Howell Aviation Advisory
   Main Stylesheet
   ============================================ */

/* --- Custom Properties --- */
:root {
    --color-primary: #0062a0;
    --color-primary-dark: #004a7a;
    --color-primary-darker: #003358;
    --color-accent: #0080cc;
    --color-navy: #1a2332;
    --color-navy-light: #243044;
    --color-text: #2d3436;
    --color-text-light: #636e72;
    --color-text-inverse: #ffffff;
    --color-bg: #ffffff;
    --color-bg-light: #f5f7fa;
    --color-bg-alt: #eef2f7;
    --color-border: #dde3ea;
    --color-success: #27ae60;

    --font-stack: 'Arial', 'Liberation Sans', 'Helvetica Neue', sans-serif;
    --font-size-base: 17px;
    --line-height: 1.7;

    --max-width: 1140px;
    --max-width-narrow: 800px;
    --header-height: 72px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);

    --radius: 6px;
    --transition: 0.25s ease;
}

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

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-stack);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: var(--line-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
    list-style: none;
}

.container--narrow ul {
    list-style: disc;
    padding-left: 1.5em;
    margin-bottom: 1.5em;
}

.container--narrow ol {
    list-style: decimal;
    padding-left: 1.5em;
    margin-bottom: 1.5em;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-navy);
    line-height: 1.25;
    font-weight: 700;
}

h1 {
    font-size: 2.6rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
}

h4 {
    font-size: 1.15rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1.25rem;
}

p:last-child {
    margin-bottom: 0;
}

strong {
    font-weight: 700;
}

/* --- Layout --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.container--narrow {
    max-width: var(--max-width-narrow);
}

.section {
    padding: 5rem 0;
}

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

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

.section--dark {
    background-color: var(--color-navy);
    color: var(--color-text-inverse);
}

.section--dark h2,
.section--dark h3 {
    color: var(--color-text-inverse);
}

.section__header {
    text-align: center;
    margin-bottom: 3rem;
}

.section__header p {
    color: var(--color-text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0.75rem auto 0;
}

/* --- Header / Navigation --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-navy);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.header__logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    letter-spacing: 0.02em;
}

.header__logo:hover {
    color: var(--color-text-inverse);
    opacity: 0.9;
}

.header__logo span {
    color: var(--color-accent);
}

.nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav__link {
    color: rgba(255, 255, 255, 0.85);
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius);
    font-size: 0.92rem;
    font-weight: 500;
    transition: all var(--transition);
    position: relative;
}

.nav__link:hover,
.nav__link--active {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
}

/* Services dropdown */
.nav__dropdown {
    position: relative;
}

.nav__dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 280px;
    padding: 0.5rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all var(--transition);
    margin-top: 0.5rem;
}

.nav__dropdown:hover .nav__dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav__dropdown-link {
    display: block;
    padding: 0.65rem 1.25rem;
    color: var(--color-text);
    font-size: 0.9rem;
    transition: background-color var(--transition);
}

.nav__dropdown-link:hover {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: #ffffff;
    margin: 5px 0;
    transition: all var(--transition);
    border-radius: 2px;
}

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

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

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

/* --- Hero --- */
.hero {
    padding: 8rem 0 5rem;
    background-color: var(--color-navy);
    color: var(--color-text-inverse);
    margin-top: var(--header-height);
}

.hero--home {
    padding: 10rem 0 7rem;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-primary-darker) 100%);
}

.hero h1 {
    color: var(--color-text-inverse);
    margin-bottom: 1.25rem;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 700px;
    line-height: 1.6;
}

.hero__subtitle--home {
    font-size: 1.35rem;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    font-family: var(--font-stack);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

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

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.btn--outline {
    background-color: transparent;
    color: var(--color-text-inverse);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn--outline:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: #ffffff;
    color: var(--color-text-inverse);
}

.btn--secondary {
    background-color: var(--color-bg-light);
    color: var(--color-primary);
    border-color: var(--color-border);
}

.btn--secondary:hover {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.btn--large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.hero .btn {
    margin-top: 2rem;
}

.hero .btn + .btn {
    margin-left: 1rem;
}

/* --- Cards --- */
.cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.cards--3 {
    grid-template-columns: repeat(3, 1fr);
}

.cards--4 {
    grid-template-columns: repeat(4, 1fr);
}

.card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: all var(--transition);
}

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

.card__icon {
    width: 48px;
    height: 48px;
    background-color: var(--color-bg-alt);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    color: var(--color-primary);
    font-size: 1.5rem;
}

.card h3 {
    color: var(--color-navy);
}

.card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.card__link {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--color-primary);
}

.card__link::after {
    content: ' \2192';
    transition: transform var(--transition);
}

.card:hover .card__link::after {
    margin-left: 4px;
}

/* --- Credentials Strip --- */
.credentials {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
    padding: 2.5rem 0;
}

.credentials__item {
    font-size: 0.95rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.85);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    white-space: nowrap;
}

.credentials__divider {
    width: 4px;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
}

/* --- Achievements / Stats --- */
.achievements {
    list-style: none;
    padding: 0;
}

.achievements li {
    padding: 0.75rem 0;
    padding-left: 1.75rem;
    position: relative;
    font-size: 1.05rem;
}

.achievements li::before {
    content: '\2192';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.achievements--two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 3rem;
}

/* --- Service Page Content --- */
.service-content h3 {
    color: var(--color-primary-dark);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-bg-alt);
}

.service-content h3:first-of-type {
    margin-top: 0;
}

.service-list {
    list-style: none;
    padding: 0;
    margin-bottom: 2rem;
}

.service-list li {
    padding: 0.6rem 0 0.6rem 1.75rem;
    position: relative;
    line-height: 1.6;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 1rem;
    width: 8px;
    height: 8px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

.service-list li strong {
    color: var(--color-navy);
}

/* --- About Page --- */
.about-intro {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    align-items: start;
}

.about-photo {
    width: 280px;
    height: 340px;
    background-color: var(--color-bg-alt);
    border-radius: var(--radius);
    overflow: hidden;
    border: 3px solid var(--color-border);
}

.about-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-photo--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.85rem;
}

.credential-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.credential-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    border-left: 4px solid var(--color-primary);
}

.credential-card h4 {
    color: var(--color-navy);
    margin-bottom: 0.5rem;
}

.credential-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* --- Case Studies --- */
.case-study {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2.5rem;
    margin-bottom: 2rem;
    border-left: 4px solid var(--color-primary);
}

.case-study h3 {
    margin-top: 0;
    border: none;
    padding-bottom: 0;
}

.case-study__label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.case-study__meta {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-style: italic;
    margin-bottom: 1.5rem;
}

.case-study h4 {
    color: var(--color-primary-dark);
    margin-top: 1.25rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* --- Insights / Blog --- */
.article-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: all var(--transition);
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.article-card__date {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.article-card h3 {
    margin-bottom: 0.75rem;
}

.article-card h3 a {
    color: var(--color-navy);
}

.article-card h3 a:hover {
    color: var(--color-primary);
}

.article-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.article-card__tag {
    display: inline-block;
    background-color: var(--color-bg-alt);
    color: var(--color-primary-dark);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 0.25rem 0.65rem;
    border-radius: 3px;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

/* --- Contact Form --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.92rem;
    margin-bottom: 0.4rem;
    color: var(--color-navy);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: var(--font-stack);
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 98, 160, 0.1);
}

.form-group textarea {
    min-height: 160px;
    resize: vertical;
}

.contact-info {
    padding-top: 0.5rem;
}

.contact-info__item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.75rem;
}

.contact-info__icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
    background-color: var(--color-bg-alt);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 1.1rem;
}

.contact-info__label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.2rem;
}

.contact-info__value {
    font-size: 1rem;
}

.contact-info__value a {
    color: var(--color-text);
}

.contact-info__value a:hover {
    color: var(--color-primary);
}

/* --- Footer --- */
.footer {
    background-color: var(--color-navy);
    color: rgba(255, 255, 255, 0.6);
    padding: 2.5rem 0;
    font-size: 0.88rem;
}

.footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer a {
    color: rgba(255, 255, 255, 0.7);
}

.footer a:hover {
    color: #ffffff;
}

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

/* --- CTA Section --- */
.cta-section {
    text-align: center;
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-primary-darker) 100%);
    color: var(--color-text-inverse);
}

.cta-section h2 {
    color: var(--color-text-inverse);
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 650px;
    margin: 0 auto 2rem;
}

/* --- Utility --- */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mt-5 { margin-top: 3rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .cards--4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .cards--3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .achievements--two-col {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.6rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    .section {
        padding: 3.5rem 0;
    }

    /* Mobile nav */
    .nav-toggle {
        display: block;
    }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-navy);
        flex-direction: column;
        align-items: stretch;
        padding: 1.5rem;
        gap: 0;
        transform: translateX(100%);
        transition: transform var(--transition);
    }

    .nav.active {
        transform: translateX(0);
    }

    .nav__link {
        padding: 0.85rem 1rem;
        font-size: 1rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .nav__dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background-color: transparent;
        margin-top: 0;
        padding: 0;
        padding-left: 1rem;
    }

    .nav__dropdown-link {
        color: rgba(255, 255, 255, 0.7);
        padding: 0.65rem 1rem;
    }

    .nav__dropdown-link:hover {
        background-color: transparent;
        color: #ffffff;
    }

    /* Hero */
    .hero {
        padding: 6rem 0 3.5rem;
    }

    .hero--home {
        padding: 7rem 0 4.5rem;
    }

    .hero__subtitle,
    .hero__subtitle--home {
        font-size: 1.1rem;
    }

    .hero .btn + .btn {
        margin-left: 0;
        margin-top: 0.75rem;
    }

    .hero .btn {
        display: block;
        width: 100%;
    }

    /* Cards */
    .cards,
    .cards--3,
    .cards--4 {
        grid-template-columns: 1fr;
    }

    /* About */
    .about-intro {
        grid-template-columns: 1fr;
    }

    .about-photo {
        width: 200px;
        height: 250px;
        margin: 0 auto;
    }

    .credential-cards {
        grid-template-columns: 1fr;
    }

    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* Credentials strip */
    .credentials {
        gap: 1rem;
    }

    .credentials__divider {
        display: none;
    }

    /* Footer */
    .footer__inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .footer__links {
        justify-content: center;
    }
}

/* --- Cookie Consent Banner --- */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--color-navy);
    color: var(--color-text-inverse);
    z-index: 9999;
    padding: 1.25rem 2rem;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
    transform: translateY(100%);
    transition: transform 0.35s ease;
}

.cookie-banner--visible {
    transform: translateY(0);
}

.cookie-banner__inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.cookie-banner__text {
    font-size: 0.92rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0;
    line-height: 1.5;
}

.cookie-banner__actions {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.cookie-banner__btn {
    font-family: var(--font-stack);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 0.55rem 1.5rem;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.cookie-banner__btn--accept {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

.cookie-banner__btn--accept:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.cookie-banner__btn--reject {
    background-color: transparent;
    color: rgba(255, 255, 255, 0.8);
    border-color: rgba(255, 255, 255, 0.3);
}

.cookie-banner__btn--reject:hover {
    border-color: rgba(255, 255, 255, 0.6);
    color: #ffffff;
}

@media (max-width: 768px) {
    .cookie-banner {
        padding: 1.25rem;
    }

    .cookie-banner__inner {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .cookie-banner__actions {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.7rem;
    }

    .hero--home {
        padding: 6rem 0 3.5rem;
    }

    .case-study {
        padding: 1.5rem;
    }
}

/* --- Dark Mode --- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #3a9fd8;
        --color-primary-dark: #2b8bc4;
        --color-primary-darker: #1a2332;
        --color-accent: #4db0e6;
        --color-navy: #111820;
        --color-navy-light: #1a2332;
        --color-text: #d8dce0;
        --color-text-light: #9aa3a9;
        --color-text-inverse: #ffffff;
        --color-bg: #1a1f28;
        --color-bg-light: #212832;
        --color-bg-alt: #252d38;
        --color-border: #2e3844;
        --color-success: #2ecc71;

        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.35);
        --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
    }

    h1, h2, h3, h4, h5, h6 {
        color: #e8ecf0;
    }

    .card h3,
    .article-card h3 a,
    .credential-card h4,
    .form-group label,
    .service-list li strong {
        color: #e8ecf0;
    }

    img {
        opacity: 0.92;
    }

    img:hover {
        opacity: 1;
    }
}