/*
 * SeaLand Gear ESG Calculator - Brand-Aligned Stylesheet
 * Matching sealandgear.com design aesthetic
 *
 * Colors:
 * - Black: #000000 (primary background)
 * - White: #FFFFFF (primary text)
 * - Orange: #FF5B00 (accent/CTA)
 * - Dark Gray: #1a1a1a (secondary backgrounds)
 * - Light Gray: #cccccc (secondary text)
 */

@import url('https://fonts.googleapis.com/css2?family=Barlow:wght@300;400;500;600;700&display=swap');

:root {
    --sealand-black: #000000;
    --sealand-white: #FFFFFF;
    --sealand-orange: #FF5B00;
    --sealand-dark-gray: #1a1a1a;
    --sealand-light-gray: #cccccc;
    --sealand-border: #333333;
    --font-primary: 'Barlow', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--sealand-black);
    color: var(--sealand-white);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header / Navigation */
header {
    background-color: var(--sealand-black);
    border-bottom: 1px solid var(--sealand-border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.logo:hover {
    opacity: 0.8;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    color: var(--sealand-white);
    font-size: 1.5rem;
    font-weight: 600;
    margin-left: 0.75rem;
    letter-spacing: -0.5px;
}

/* Navigation */
nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--sealand-white);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    transition: color 0.3s ease;
    position: relative;
}

nav a:hover {
    color: var(--sealand-orange);
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--sealand-orange);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 0;
}

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

.btn-primary:hover {
    background-color: #E55100;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 91, 0, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: var(--sealand-white);
    border: 2px solid var(--sealand-white);
}

.btn-secondary:hover {
    background-color: var(--sealand-white);
    color: var(--sealand-black);
}

/* Main Content */
main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.25rem;
}

h3 {
    font-size: 1.5rem;
}

/* Cards */
.card {
    background-color: var(--sealand-dark-gray);
    border: 1px solid var(--sealand-border);
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(255, 91, 0, 0.15);
}

.card-title {
    color: var(--sealand-white);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.card-body {
    color: var(--sealand-light-gray);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background-color: var(--sealand-dark-gray);
    border-left: 4px solid var(--sealand-orange);
    padding: 2rem;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-label {
    color: var(--sealand-light-gray);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--sealand-white);
    margin-bottom: 0.25rem;
}

.stat-unit {
    color: var(--sealand-light-gray);
    font-size: 0.875rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--sealand-dark-gray);
    margin-bottom: 2rem;
}

thead {
    background-color: var(--sealand-black);
    border-bottom: 2px solid var(--sealand-orange);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
    color: var(--sealand-white);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--sealand-border);
    color: var(--sealand-light-gray);
}

tr:hover {
    background-color: rgba(255, 91, 0, 0.05);
}

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

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--sealand-white);
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.875rem;
    font-family: var(--font-primary);
    font-size: 1rem;
    background-color: var(--sealand-dark-gray);
    border: 1px solid var(--sealand-border);
    color: var(--sealand-white);
    transition: border-color 0.3s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--sealand-orange);
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-success {
    background-color: rgba(46, 204, 113, 0.1);
    border-color: #2ECC71;
    color: #2ECC71;
}

.alert-info {
    background-color: rgba(52, 152, 219, 0.1);
    border-color: #3498DB;
    color: #3498DB;
}

.alert-warning {
    background-color: rgba(243, 156, 18, 0.1);
    border-color: #F39C12;
    color: #F39C12;
}

.alert-danger {
    background-color: rgba(231, 76, 60, 0.1);
    border-color: #E74C3C;
    color: #E74C3C;
}

/* Footer */
footer {
    background-color: var(--sealand-black);
    border-top: 1px solid var(--sealand-border);
    padding: 2rem;
    margin-top: 4rem;
    text-align: center;
    color: var(--sealand-light-gray);
    font-size: 0.875rem;
}

footer a {
    color: var(--sealand-orange);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--sealand-white);
}

/* Utility Classes */
.text-orange {
    color: var(--sealand-orange);
}

.text-muted {
    color: var(--sealand-light-gray);
}

.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

/* Chart Containers */
.chart-container {
    background-color: var(--sealand-dark-gray);
    border: 1px solid var(--sealand-border);
    padding: 2rem;
    margin-bottom: 2rem;
}

.chart-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--sealand-white);
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-wrap: wrap;
        gap: 1rem;
        justify-content: center;
    }

    h1 {
        font-size: 2rem;
    }

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

    main {
        padding: 2rem 1rem;
    }
}

/* Loading Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease;
}