/* 
  Sasindu Dilshara - Premium Freelance Portfolio
  Design System: Modern Startup + Agency Hybrid
*/

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-footer: #000000;
    --accent: #2563eb; /* Trust Blue */
    --accent-light: #60a5fa;
    --accent-dark: #1e40af;
    --accent-gradient: linear-gradient(135deg, #2563eb, #60a5fa);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --glass: rgba(255, 255, 255, 0.7);
    --glass-blur: blur(12px);
    --glass-border: rgba(255, 255, 255, 0.3);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --transition-slow: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    --transition-fast: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Loading Overlay */
#loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader-bar {
    width: 200px;
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.loader-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent-gradient);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); line-height: 1.1; }
h2 { font-size: clamp(2rem, 4vw, 3rem); line-height: 1.2; }

p {
    color: var(--text-secondary);
}

span.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Selection */
::selection {
    background: var(--accent);
    color: white;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 100px 0;
}

/* Header */
header {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 1100px;
    z-index: 1000;
    padding: 0.7rem 1.2rem;
    background: var(--glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-slow);
}

header.scrolled {
    top: 10px;
    width: 95%;
    background: rgba(255, 255, 255, 0.9);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-text {
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--text-primary);
    line-height: 1.2;
    border-left: 1px solid var(--border);
    padding-left: 10px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.8rem 1.8rem;
    border-radius: 100px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-slow);
    cursor: pointer;
    font-size: 0.95rem;
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border);
}

.btn-outline:hover {
    background: var(--bg-secondary);
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 120px;
    background: radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 40%),
                radial-gradient(circle at bottom left, rgba(37, 99, 235, 0.08), transparent 40%);
}

.hero-content {
    max-width: 800px;
}

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(37, 99, 235, 0.1);
    color: var(--accent);
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    margin-top: 2.5rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: var(--transition-slow);
}

.split-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: flex-start;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .split-grid, .grid-2 {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .grid-2 {
        gap: 1rem;
    }
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--accent-light);
    box-shadow: var(--shadow-xl);
}

.glass-card {
    background: var(--glass);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
}

.hero-card {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 5rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
    .hero-card {
        padding: 2.5rem 1.5rem;
    }
}

/* Portfolio Items */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.portfolio-item {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    transition: var(--transition-slow);
    display: grid;
    grid-template-columns: 1fr 1fr;
}

@media (max-width: 992px) {
    .portfolio-item {
        grid-template-columns: 1fr;
    }
}

.portfolio-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition-slow);
}

.portfolio-item:hover .portfolio-img {
    transform: scale(1.05);
}

.portfolio-content {
    padding: 2rem;
}

/* Stats/Tools */
.tools-flex {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.tool-tag {
    padding: 8px 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.tool-tag:hover {
    background: white;
    border-color: var(--accent);
    color: var(--accent);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-input {
    width: 100%;
    padding: 0.8rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    transition: var(--transition-fast);
    font-size: 1rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    background: white;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

/* Floating WhatsApp */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: #25d366;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 25px rgba(37, 211, 102, 0.3);
    z-index: 1001;
    transition: var(--transition-slow);
    text-decoration: none;
}

.whatsapp-float:hover {
    transform: scale(1.1) translateY(-5px);
    box-shadow: 0 15px 35px rgba(37, 211, 102, 0.4);
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

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

/* Footer */
footer {
    background: var(--bg-footer);
    color: white;
    padding: 80px 0 40px;
}

.payment-methods {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-top: 1.5rem;
}

.payment-icon {
    height: 25px;
    width: auto;
    object-fit: contain;
    opacity: 0.6;
    transition: var(--transition-fast);
}

footer .payment-icon {
    filter: brightness(0) invert(1);
}

.payment-icon:hover {
    filter: none !important;
    opacity: 1;
}

.hero-payments {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.hero-payments span {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}

.hero-payments .payment-icon {
    height: 16px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-logo {
    height: 40px;
    background: white;
    padding: 5px;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.footer-links h4 { color: white; margin-bottom: 1.5rem; }
.footer-links a { display: block; color: var(--text-muted); text-decoration: none; margin-bottom: 0.8rem; transition: var(--transition-fast); }
.footer-links a:hover { color: white; }

/* Responsive Improvements */
@media (max-width: 1024px) {
    .container {
        padding: 0 2rem;
    }
}

@media (max-width: 768px) {
    header {
        width: 95%;
        padding: 0.6rem 1rem;
        border-radius: var(--radius-md);
    }

    .nav-links {
        position: fixed;
        top: 80px;
        left: 50%;
        transform: translateX(-50%) translateY(-20px);
        width: 90%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-xl);
        border: 1px solid var(--border);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-fast);
        z-index: 999;
        text-align: center;
        gap: 1.5rem;
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

    .nav-links a {
        font-size: 1.1rem;
        display: block;
        padding: 0.5rem;
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: 10px;
        background: var(--bg-secondary);
        color: var(--text-primary);
    }

    nav .btn-primary {
        display: none; /* Hide button in nav on mobile, use it in hero or menu */
    }

    /* Hero Responsive */
    .hero {
        padding-top: 140px;
        text-align: center;
        min-height: auto;
        padding-bottom: 60px;
    }

    .hero-content {
        margin: 0 auto;
    }

    .hero-btns {
        flex-direction: column;
        gap: 1rem;
    }

    .hero-btns .btn {
        width: 100%;
    }

    /* Grid Improvements */
    .card-grid {
        grid-template-columns: 1fr;
    }

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

    /* Footer Responsive */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }

    .footer-logo {
        margin-left: auto;
        margin-right: auto;
    }

    .footer-links {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --radius-lg: 16px;
        --radius-xl: 24px;
    }

    h1 { font-size: 2.2rem; }
    h2 { font-size: 1.8rem; }
    
    section {
        padding: 60px 0;
    }

    .logo-text {
        display: none;
    }

    .hero-tag {
        font-size: 0.75rem;
    }

    .card {
        padding: 1.5rem;
    }

    .pricing-card {
        padding: 2rem 1.5rem !important;
    }

    .whatsapp-float {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }
}