/* ==========================================
    1. VARIABLES & RESET
    ========================================== */
:root {
    --primary-red: #A51C30;           /* Professional Medical Red */
    --light-bg: #fdfdfd;              
    --secondary-bg: #f4f7f8;          
    --card-bg: #ffffff;
    --text-main: #2d3436;
    --text-muted: #636e72;
    --glass-border: rgba(255, 255, 255, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--light-bg);
    color: var(--text-main);
    overflow-x: hidden;
    line-height: 1.6;
    padding-top: 75px;
}

/* ==========================================
    2. HEADER & NAVIGATION
    ========================================== */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 75px;
    background: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
    opacity: 1;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.logo { 
    height: 35px; 
    width: auto;
    filter: contrast(110%);
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.company-name {
    font-family: 'Merriweather', serif;
    font-weight: 700;
    color: var(--primary-red);
    letter-spacing: 0.5px;
    font-size: 1.4rem;
    height: 35px; 
    line-height: 35px;
    white-space: nowrap;
}

.nav-links { 
    display: flex; 
    align-items: center;
    gap: 0;
}

.nav-links a {
    color: #333; 
    text-decoration: none;
    padding: 8px 22px;
    font-size: 0.9rem;
    font-weight: 600;
    position: relative;
    transition: color 0.3s ease;
}

.nav-links a:hover { 
    color: var(--primary-red); 
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--primary-red);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-links a:hover::after { 
    width: 80%;
}

/* ==========================================
    HAMBURGER MENU STYLES
    ========================================== */

.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 6px;
    padding: 10px;
    z-index: 1001;
    flex-shrink: 0;
}

.hamburger:focus {
    outline: 2px solid var(--primary-red);
    outline-offset: 2px;
    border-radius: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-red);
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    transform-origin: center;
    display: block;
}

/* Hamburger active state (X shape) */
.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(10px, 10px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -8px);
}

/* ==========================================
    3. HERO SECTION
    ========================================== */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 20px;
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(18, 25, 33, 0.7)), 
                url('ekg.png') center/cover no-repeat; 
    margin-top: -75px;
    padding-top: 75px;
}

.hero h1 { 
    font-family: 'Merriweather', serif; 
    font-size: 3.5rem; 
    color: var(--primary-red); 
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(25px);
    animation: smoothFadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

.hero h2 { 
    font-family: 'Merriweather', serif; 
    font-size: 1.75rem; 
    color: #ffffff; 
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(25px);
    animation: smoothFadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.4s forwards;
}

.hero p { 
    font-size: 1.2rem; 
    color: rgba(255, 255, 255, 0.9); 
    max-width: 700px; 
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(25px);
    animation: smoothFadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.6s forwards;
}

.hero a {
    display: inline-block;
    background: var(--primary-red);
    color: #fff;
    padding: 16px 45px; 
    text-decoration: none;
    border-radius: 50px; 
    margin-bottom: 30px; 
    font-weight: bold;
    transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
    opacity: 0;
    transform: translateY(25px);
    animation: smoothFadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.8s forwards, heartPulse 2s infinite 2.8s;
    position: relative;
    z-index: 5;
    border: none;
    cursor: pointer;
}

.hero a:hover {
    background: #8a1625;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(165, 28, 48, 0.3);
}

.hero a:active {
    transform: translateY(0);
}

/* ==========================================
    4. PROJECT CARDS
    ========================================== */
.projects-container {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 120px 5% 80px;
    flex-wrap: wrap;
    background: linear-gradient(to bottom, 
                rgba(18, 25, 33, 1) 0%, 
                rgba(18, 25, 33, 1) 15%, 
                #e2e6e9 65%, 
                #d1d8dc 100%);
}

.project-card {
    background: var(--card-bg);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 16px;
    padding: 40px 25px;
    width: 320px;
    min-height: 480px;
    text-align: center;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    opacity: 0;
    animation: smoothFadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.project-card h3 {
    color: var(--text-main);
    font-size: 1.3rem;
    margin: 20px 0 15px;
    font-weight: 700;
}

.project-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.ekg-container {
    width: 100%;
    height: 80px;
    margin-bottom: 20px;
}

.ekg-container svg {
    width: 100%;
    height: 100%;
}

.project-card:hover {
    transform: translateY(-12px);
    border-color: var(--primary-red);
    box-shadow: 0 20px 40px rgba(165, 28, 48, 0.15);
}

/* ==========================================
    5. REVEAL ANIMATIONS & KEYFRAMES
    ========================================= */
@keyframes smoothFadeUp {
    from { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes heartPulse {
    0% { 
        transform: scale(1); 
        box-shadow: 0 4px 15px rgba(165, 28, 48, 0.4); 
    }
    50% { 
        transform: scale(1.06); 
        box-shadow: 0 4px 25px rgba(165, 28, 48, 0.7); 
    }
    100% { 
        transform: scale(1); 
        box-shadow: 0 4px 15px rgba(165, 28, 48, 0.4); 
    }
}

@keyframes heartbeat {
    0% { 
        stroke-dashoffset: 1000; 
        opacity: 1; 
    }
    40% { 
        stroke-dashoffset: 0; 
        opacity: 1; 
    }
    100% { 
        stroke-dashoffset: 0; 
        opacity: 0; 
    }
}

.ekg-line {
    stroke: var(--primary-red);
    stroke-width: 3;
    fill: none;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: heartbeat 4s linear infinite;
}

/* ==========================================
    6. FOOTER
    ========================================== */
footer {
    text-align: center;
    padding: 40px 20px;
    background: #ffffff;
    color: var(--text-muted);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 0.9rem;
    position: relative;
    z-index: 10;
}

footer p {
    margin: 10px 0;
}

footer p:first-child {
    font-style: italic;
    color: var(--text-main);
    font-size: 1rem;
    margin-bottom: 20px;
}

/* ==========================================
    REVEAL CLASS (For Scroll Animations)
    ========================================== */
.reveal {
    opacity: 0;
    animation: smoothFadeUp 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

/* ==========================================
    MOBILE RESPONSIVE (768px and below)
    ========================================== */
@media (max-width: 768px) {
    body {
        padding-top: 75px;
    }

    .site-header {
        padding: 0 4%;
    }

    .company-name {
        font-size: 1.1rem;
    }

    /* Show hamburger on mobile */
    .hamburger {
        display: flex;
    }

    /* Hide nav links on desktop, show on mobile when active */
    .nav-links {
        position: fixed;
        top: 75px;
        left: 0;
        width: 100%;
        height: auto;
        background: #ffffff;
        flex-direction: column;
        padding: 0;
        border-bottom: 1px solid var(--glass-border);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        gap: 0;
    }

    /* Menu expands when active */
    .nav-links.active {
        max-height: 500px;
    }

    .nav-links a {
        padding: 16px 20px;
        margin-left: 0;
        border-bottom: 1px solid rgba(165, 28, 48, 0.1);
        text-align: left;
        display: block;
        width: 100%;
        transition: background 0.3s ease, color 0.3s ease;
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    .nav-links a:active {
        background: var(--secondary-bg);
    }

    .nav-links a:hover {
        background: var(--secondary-bg);
        color: var(--primary-red);
    }

    /* Remove desktop hover underline on mobile */
    .nav-links a::after {
        display: none;
    }

    /* Adjust hero section */
    .hero {
        padding: 0 20px;
    }

    .hero h1 {
        font-size: 2.2rem;
        margin-bottom: 15px;
    }

    .hero h2 {
        font-size: 1.3rem;
        margin-bottom: 15px;
    }

    .hero p {
        font-size: 1rem;
        max-width: 90%;
    }

    .hero a {
        padding: 14px 35px;
        font-size: 0.95rem;
    }

    /* Adjust project cards for mobile */
    .projects-container {
        padding: 60px 5% 50px;
        gap: 20px;
    }

    .project-card {
        width: 100%;
        max-width: 100%;
        min-height: auto;
        padding: 30px 20px;
    }

    .ekg-container {
        height: 60px;
    }

    /* Footer adjustments */
    footer {
        padding: 30px 20px;
    }

    footer p:first-child {
        font-size: 0.95rem;
    }
}

/* ==========================================
    TABLET RESPONSIVE (769px - 1024px)
    ========================================== */
@media (max-width: 1024px) and (min-width: 769px) {
    .company-name {
        font-size: 1.2rem;
    }

    .nav-links a {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

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

    .projects-container {
        gap: 25px;
        padding: 100px 5% 70px;
    }

    .project-card {
        width: 280px;
    }
}

/* ==========================================
    LARGE SCREENS (1025px and above)
    ========================================== */
@media (min-width: 1025px) {
    .hamburger {
        display: none !important;
    }

    .nav-links {
        display: flex !important;
        position: static !important;
        max-height: none !important;
        background: transparent !important;
        box-shadow: none !important;
        border: none !important;
        top: auto !important;
    }
}