:root {
    /* Color Variables */
    --light-bg-color: #f4f7f9;
    --dark-bg-color: #0d1117;
    --card-bg-color-light: #ffffff;
    --card-bg-color-dark: #161b22;
    --text-color-light: #333;
    --text-color-dark: #c9d1d9;
    --border-color-light: #e1e4e8;
    --border-color-dark: #30363d;
    --primary-blue: #4A90E2;
    --secondary-blue: #2D58A0;

    /* Spacing Variables (using a modular scale) */
    --space-xs: 0.5rem;   /* 8px */
    --space-sm: 0.75rem;  /* 12px */
    --space-md: 1rem;     /* 16px */
    --space-lg: 1.5rem;   /* 24px */
    --space-xl: 2rem;     /* 32px */
    --space-xxl: 3rem;    /* 48px */
}

.remove-item-btn {
    background: none;
    border: none;
    color: #999;
    font-size: 1.2em;
    cursor: pointer;
    padding: 5px;
    transition: color 0.2s ease;
}

.remove-item-btn:hover {
    color: #333;
}

/* --- Global Styles --- */
body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    line-height: 1.6;
    background-color: var(--light-bg-color);
    color: var(--text-color-light);
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-theme {
    background-color: var(--dark-bg-color);
    color: var(--text-color-dark);
}

.flex-container {
    display: grid;
    gap: var(--space-xl);
    padding: var(--space-xl) var(--space-md);
}

/* --- Responsiveness: Desktop Layout --- */
@media (min-width: 1024px) {
    .flex-container {
        grid-template-columns: 1fr 2fr; /* Creates a two-column layout */
        padding: var(--space-xxl);
    }
}

.input-form,
.controls {
    background-color: var(--card-bg-color-light);
    border-radius: 16px; /* Slightly larger radius for a modern feel */
    padding: var(--space-xl);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

body.dark-theme .input-form,
body.dark-theme .controls {
    background-color: var(--card-bg-color-dark);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.input-form h1 {
    font-size: clamp(1.8rem, 5vw, 2.5rem); /* Responsive font size */
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: var(--space-sm);
}

.input-form p {
    font-size: clamp(1rem, 2vw, 1.1rem);
    color: var(--text-color-light);
    margin-bottom: var(--space-lg);
}

body.dark-theme .input-form p {
    color: var(--text-color-dark);
}

/* --- Input Section Styles --- */
.input-section {
    border-radius: 12px;
    border: 1px solid var(--border-color-light);
    margin-bottom: var(--space-lg);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

body.dark-theme .input-section {
    border: 1px solid var(--border-color-dark);
    box-shadow: none;
}

.input-section h3 {
    background-color: var(--primary-blue);
    color: #fff;
    margin: 0;
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s ease;
}

.input-section h3 .toggle-icon {
    font-size: 1.5em;
    font-weight: bold;
    color: #fff;
    transform: rotate(0deg);
    transition: transform 0.3s ease;
}

.input-section.active .toggle-icon {
    transform: rotate(45deg);
}

.collapsible-content {
    padding: var(--space-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out; /* Slower transition for a smoother feel */
}

.input-section.active .collapsible-content {
    max-height: 5000px; /* A large value to accommodate content */
}

/* Input and Button Styles */
.input-group {
    margin-bottom: var(--space-md);
}

label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--text-color-light);
}

body.dark-theme label {
    color: var(--text-color-dark);
}

input[type="text"],
input[type="email"],
input[type="url"],
input[type="file"],
textarea,
select {
    width: 100%;
    padding: var(--space-md);
    border-radius: 8px;
    border: 1px solid var(--border-color-light);
    background-color: var(--card-bg-color-light);
    color: var(--text-color-light);
    box-sizing: border-box;
    transition: all 0.3s ease;
    -webkit-appearance: none; /* Removes default styling on some browsers */
}

body.dark-theme input,
body.dark-theme textarea,
body.dark-theme select {
    border: 1px solid var(--border-color-dark);
    background-color: #22272e;
    color: var(--text-color-dark);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

input.error,
textarea.error {
    border-color: #D62828;
    box-shadow: 0 0 0 3px rgba(214, 40, 40, 0.2);
}

.btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: bold;
    font-size: clamp(0.9rem, 2vw, 1rem);
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

#make-portfolio {
    background-color: var(--primary-blue);
    color: #fff;
}

#theme-switcher {
    background-color: var(--secondary-blue);
    color: #fff;
}

.add-item-btn {
    background-color: var(--primary-blue);
    color: #fff;
    margin-top: var(--space-md);
}

.color-options {
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.color-btn {
    width: 30px;
    height: 30px;
    border: 2px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.color-btn:hover {
    transform: scale(1.1);
}

.color-btn.active {
    border-color: var(--text-color-light);
}

body.dark-theme .color-btn.active {
    border-color: var(--text-color-dark);
}

/* --- Portfolio Page Preview Styles --- */
.portfolio-page-body {
    padding: 0;
    background-color: var(--light-bg-color);
    color: var(--text-color-light);
}

body.dark-theme.portfolio-page-body {
    background-color: var(--dark-bg-color);
    color: var(--text-color-dark);
}

.portfolio-header {
    text-align: center;
    padding: var(--space-xxl) var(--space-md);
    background-color: var(--card-bg-color-light);
    border-bottom: 1px solid var(--border-color-light);
}

body.dark-theme .portfolio-header {
    background-color: var(--card-bg-color-dark);
    border-bottom: 1px solid var(--border-color-dark);
}

.portfolio-header h1 {
    font-size: clamp(2rem, 6vw, 3rem);
    color: var(--primary-blue);
    margin-bottom: var(--space-sm);
}

.portfolio-header p {
    font-size: clamp(1rem, 2vw, 1.1rem);
    max-width: 700px;
    margin: 0 auto;
    color: var(--text-color-light);
}

body.dark-theme .portfolio-header p {
    color: var(--text-color-dark);
}

.profile-img-container {
    width: 150px;
    height: 150px;
    margin: var(--space-lg) auto 0;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary-blue);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.portfolio-content {
    padding: var(--space-lg);
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: var(--space-lg);
}

.portfolio-section {
    background-color: var(--card-bg-color-light);
    border-radius: 16px;
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

body.dark-theme .portfolio-section {
    background-color: var(--card-bg-color-dark);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.portfolio-section h2 {
    color: var(--primary-blue);
    border-bottom: 2px solid var(--secondary-blue);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-lg);
}

#skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.skill-pill {
    background-color: var(--secondary-blue);
    color: #fff;
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-size: 0.9rem;
}

.experience-item-preview,
.project-card,
.certificate-item-preview,
.volunteer-item-preview {
    margin-bottom: var(--space-lg);
    padding-left: var(--space-md);
    border-left: 3px solid var(--primary-blue);
}

.project-card img,
.certificate-img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin-top: var(--space-md);
}

.download-btn-container {
    text-align: center;
    padding: var(--space-lg);
}

.download-btn {
    background-color: var(--primary-blue);
    color: #fff;
    padding: var(--space-sm) var(--space-xl);
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.25);
}

/* --- Landing Page Styles --- */
.landing-page {
    font-family: 'Montserrat', sans-serif;
    color: #fff;
    display: center;
    place-items: center; /* Centers content both horizontally and vertically */
    min-height: 100vh;
    background: linear-gradient(135deg, #1A237E, #4A148C);
    animation: background-animate 15s ease infinite;
    overflow: hidden;
}

.landing-container {
    text-align: center;
    max-width: 600px;
    padding: var(--space-xxl);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
    animation: fade-in-up 1s ease-out;
}

.landing-container h1 {
    font-size: clamp(2.5rem, 8vw, 3.5rem);
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    margin-bottom: var(--space-md);
    animation: fade-in-up 1s ease-out;
}

.landing-container p {
    font-size: clamp(1.1rem, 3vw, 1.2rem);
    font-weight: 400;
    margin-bottom: var(--space-xxl);
    opacity: 0;
    animation: fade-in 1.5s ease-out 0.5s forwards;
}

.get-started-btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xxl);
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    color: #fff;
    background-color: #7B1FA2;
    border-radius: 50px;
    transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    opacity: 0;
    animation: fade-in 1.5s ease-out 1s forwards;
}

.get-started-btn:hover {
    background-color: #9C27B0;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

@keyframes background-animate {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}