* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(to bottom, #f8f9fa, #ffffff);
    color: #1f2937;
    transition: background 0.3s, color 0.3s;
    line-height: 1.6;
}

.dark-theme body {
    background: #0f172a;
    color: #e5e7eb;
}

/* HERO */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    animation: fadeIn 1s ease-in-out;
    color: #ffffff;
}

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

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
}

.hero span {
    color: #ffd700;
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    margin: 15px 0;
    font-size: 1.3rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}
/* link styled like the hero button for direct navigation */
.hero button {
    padding: 14px 35px;
    border: none;
    background: #ffffff;
    color: #000000;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    outline: none;
}

/* link styled like the hero button for direct navigation */
.hero-link {
    display: inline-block;
    padding: 14px 35px;
    border: none;
    background: #ffffff;
    color: #000000;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    text-decoration: none;
}

.hero-link:hover,
.hero-link:focus {
    background: #f0f0f0;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    color: #667eea;
}

.hero button:focus, .hero button:hover {
    background: #f0f0f0;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.hero img:hover {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
    transform: scale(1.05);
    transition: all 0.3s ease;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

/* SECTIONS */
section {
    padding: 100px 10%;
}

section:nth-child(even) {
    background: #f8f9fa;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: #667eea;
    font-weight: 700;
    text-align: center;
}

/* SKILLS */
.skills-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.skills-box div {
    background: #ffffff;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    border: 2px solid transparent;
    font-weight: 600;
    font-size: 1.05rem;
    color: #1f2937;
}

.skills-box div:hover {
    transform: translateY(-10px);
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #ffffff;
    border-color: #667eea;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

/* FOOTER */
footer {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #1f2937, #374151);
    border-top: 3px solid #667eea;
    color: #ffffff;
    margin-top: 50px;
}

footer p {
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* INTERLINKING STYLES */
a {
    color: #667eea;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* JSON DISPLAY STYLES */
pre {
    background: #f8f9fa;
    color: #1f2937;
    padding: 20px;
    border-radius: 12px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border-left: 4px solid #667eea;
}

code {
    background: #e5e7eb;
    padding: 3px 6px;
    border-radius: 4px;
    color: #667eea;
    font-weight: 500;
}

/* NAVIGATION */
header {
    background: linear-gradient(to right, #ffffff, #f8f9fa);
    padding: 12px 30px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    border-bottom: 1px solid #e5e7eb;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
}

nav a {
    color: #1f2937;
    text-decoration: none;
    margin: 0 15px;
    font-weight: 600;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #667eea;
}

nav button {
    background: #667eea;
    color: #ffffff;
    border: none;
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
}

nav button:hover {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
}

/* CONTAINER AND CARDS */
.container {
    margin-top: 100px;
    padding: 30px;
}

.card {
    background: #ffffff;
    margin: 25px 0;
    padding: 35px;
    border-radius: 15px;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.12);
    transform: translateY(-3px);
}

.card h1 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 2rem;
}

.dark-theme .card {
    background: #1e293b;
    color: #e5e7eb;
    border-left-color: #38bdf8;
}

.dark-theme header {
    background: linear-gradient(to right, #1e293b, #0f172a);
    border-bottom-color: #38bdf8;
}

/* CHATBOT */
#chat-container,
#chat-container-index,
#chat-container-about,
#chat-container-contact {
    max-width: 600px;
    margin: 0 auto;
    background: #ffffff;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 2px solid #e5e7eb;
}

#chat-messages,
#chat-messages-index,
#chat-messages-about,
#chat-messages-contact {
    height: 320px;
    overflow-y: auto;
    margin-bottom: 15px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #e5e7eb;
}

#chat-messages div,
#chat-messages-index div,
#chat-messages-about div,
#chat-messages-contact div {
    margin-bottom: 12px;
    padding: 10px 14px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 10px;
    color: #ffffff;
    font-weight: 500;
}

#chat-input,
#chat-input-index,
#chat-input-about,
#chat-input-contact {
    width: calc(100% - 90px);
    padding: 12px 15px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    background: #ffffff;
    color: #1f2937;
    font-size: 1rem;
    transition: all 0.3s ease;
}

#chat-input:focus,
#chat-input-index:focus,
#chat-input-about:focus,
#chat-input-contact:focus {
    border-color: #667eea;
    outline: none;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#chat-container button,
#chat-container-index button,
#chat-container-about button,
#chat-container-contact button {
    padding: 11px 18px;
    background: #667eea;
    color: #ffffff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    margin-left: 10px;
    font-weight: 600;
    transition: all 0.3s ease;
}

#chat-container button:hover,
#chat-container-index button:hover,
#chat-container-about button:hover,
#chat-container-contact button:hover {
    background: #764ba2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}