/* ==========================================
   EcoPulses - Sustainable Energy Data Analytics
   Color Palette:
   - Emerald Green: #10B981
   - Midnight Blue: #1E293B
   - Neutral Gray: #F3F4F6
   - Soft White: #FFFFFF
   ========================================== */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --emerald-green: #10B981;
    --midnight-blue: #1E293B;
    --neutral-gray: #F3F4F6;
    --soft-white: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --border-color: #E2E8F0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--soft-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Satoshi', 'Inter', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    color: var(--midnight-blue);
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.875rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--emerald-green);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: #059669;
}

/* Layout Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    background-color: var(--soft-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'Satoshi', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--midnight-blue);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--emerald-green), #059669);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.navbar-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.navbar-menu a {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.3s ease;
}

.navbar-menu a:hover {
    color: var(--emerald-green);
}

.navbar-menu a.active {
    color: var(--emerald-green);
    position: relative;
}

.navbar-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--emerald-green);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0.5rem;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--midnight-blue);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--midnight-blue) 0%, #0F172A 100%);
    color: var(--soft-white);
    padding: 8rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(16, 185, 129, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(16, 185, 129, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero h1 {
    color: var(--soft-white);
    margin-bottom: 1.5rem;
    font-size: 3.75rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #94A3B8;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero p {
    color: #CBD5E1;
    font-size: 1.125rem;
    margin-bottom: 1.25rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--emerald-green);
    color: var(--soft-white);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    background-color: #059669;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
    color: var(--soft-white);
}

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

.btn-secondary:hover {
    background-color: var(--soft-white);
    color: var(--midnight-blue);
}

.btn-outline {
    background-color: transparent;
    color: var(--emerald-green);
    border: 2px solid var(--emerald-green);
}

.btn-outline:hover {
    background-color: var(--emerald-green);
    color: var(--soft-white);
}

/* Section Styles */
.section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 4rem;
}

.section-title {
    font-size: 2.75rem;
    color: var(--midnight-blue);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

/* Grid Layouts */
.grid {
    display: grid;
    gap: 2rem;
}

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

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

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

/* Card Components */
.card {
    background-color: var(--soft-white);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.card-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--emerald-green), #059669);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    color: var(--midnight-blue);
    margin-bottom: 0.75rem;
}

.card-text {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Data Visualization Panel */
.data-panel {
    background-color: var(--soft-white);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
}

.data-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.data-panel-title {
    font-size: 1.25rem;
    color: var(--midnight-blue);
    margin: 0;
}

.data-badge {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background-color: #DCFCE7;
    color: #16A34A;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 600;
}

.metric-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.metric-row:last-child {
    border-bottom: none;
}

.metric-label {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--emerald-green);
}

/* Stats Display */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.stat-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--soft-white);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--emerald-green);
    margin-bottom: 0.5rem;
    font-family: 'Satoshi', sans-serif;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
}

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

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--midnight-blue);
    font-size: 0.9375rem;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
    background-color: var(--soft-white);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--emerald-green);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 150px;
}

/* Footer */
.footer {
    background-color: var(--midnight-blue);
    color: #CBD5E1;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    font-family: 'Satoshi', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--soft-white);
    margin-bottom: 1rem;
}

.footer-description {
    color: #94A3B8;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

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

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #94A3B8;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--emerald-green);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: #64748B;
    font-size: 0.875rem;
}

/* Breadcrumbs */
.breadcrumb {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    padding: 1.5rem 0;
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--emerald-green);
}

.breadcrumb-separator {
    color: var(--text-secondary);
}

.breadcrumb-current {
    color: var(--midnight-blue);
    font-weight: 600;
}

/* Case Study Cards */
.case-card {
    background-color: var(--soft-white);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.case-card:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.case-card-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #10B981, #059669);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.case-card-content {
    padding: 1.5rem;
}

.case-card-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: #DCFCE7;
    color: #16A34A;
    border-radius: 4px;
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.case-card-title {
    font-size: 1.25rem;
    color: var(--midnight-blue);
    margin-bottom: 0.75rem;
}

.case-card-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    h1 {
        font-size: 2.75rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero h1 {
        font-size: 3rem;
    }

    .grid-3,
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

@media (max-width: 768px) {
    .container,
    .container-wide {
        padding: 0 1.5rem;
    }

    .navbar-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--soft-white);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        display: none;
    }

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

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: 5rem 0 4rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .section {
        padding: 4rem 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

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

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero h1 {
        font-size: 1.875rem;
    }

    .navbar-brand {
        font-size: 1.25rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9375rem;
    }
}

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

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

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

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

.pt-1 { padding-top: 0.5rem; }
.pt-2 { padding-top: 1rem; }
.pt-3 { padding-top: 1.5rem; }
.pt-4 { padding-top: 2rem; }

.pb-1 { padding-bottom: 0.5rem; }
.pb-2 { padding-bottom: 1rem; }
.pb-3 { padding-bottom: 1.5rem; }
.pb-4 { padding-bottom: 2rem; }