/* ========================================
   Binding Site Prediction Tool - Landing Page Styles
   ======================================== */

/* Import Inter font for modern typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ========================================
   CSS Variables - Matching Website Theme
   ======================================== */
:root {
    --primary: #FEA116;
    --primary-dark: #e89100;
    --primary-light: #ffb03a;
    --dark: #0F172B;
    --dark-secondary: #1e293b;
    --light: #F1F8FF;
    --light-secondary: #e0f2fe;
    --white: #ffffff;
    --gray-100: #f8fafc;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Shadows */
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   Tool Section Container
   ======================================== */
.tool-landing-container {
    background: linear-gradient(135deg, var(--light) 0%, var(--white) 100%);
    min-height: 80vh;
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

.tool-landing-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 30%, rgba(254, 161, 22, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(15, 23, 43, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.tool-landing-container>* {
    position: relative;
    z-index: 1;
}

/* ========================================
   Hero Section
   ======================================== */
.tool-hero {
    text-align: center;
    margin-bottom: 50px;
    animation: fadeInDown 0.8s ease-out;
}

.tool-hero-title {
    font-family: 'Nunito', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 15px;
    line-height: 1.2;
}

.tool-hero-title .highlight {
    color: var(--primary);
    position: relative;
    display: inline-block;
}

.tool-hero-subtitle {
    font-family: 'Inter', sans-serif;
    font-size: 1.1rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto 25px;
    line-height: 1.6;
}

.tool-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: var(--white);
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    animation: pulse 2s ease-in-out infinite;
}

.tool-hero-badge i {
    font-size: 1rem;
}

/* ========================================
   Input Cards Container
   ======================================== */
.tool-input-section {
    margin-bottom: 40px;
}

.tool-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

/* ========================================
   Input Card Styles
   ======================================== */
.tool-card {
    background: var(--white);
    border-radius: 16px;
    padding: 35px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.tool-card:nth-child(1) {
    animation-delay: 0.1s;
}

.tool-card:nth-child(2) {
    animation-delay: 0.2s;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary);
}

.tool-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--gray-200);
}

.tool-card-icon {
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.3rem;
    box-shadow: var(--shadow-md);
}

.tool-card-title {
    font-family: 'Nunito', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    margin: 0;
}

.tool-card-body {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ========================================
   File Upload Zone
   ======================================== */
.file-upload-zone {
    border: 2px dashed var(--gray-300);
    border-radius: 12px;
    padding: 25px 20px;
    text-align: center;
    background: var(--gray-100);
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.file-upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(254, 161, 22, 0.1), transparent);
    transition: left var(--transition-slow);
}

.file-upload-zone:hover::before {
    left: 100%;
}

.file-upload-zone:hover {
    border-color: var(--primary);
    background: var(--light);
    transform: scale(1.02);
}

.file-upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(254, 161, 22, 0.1);
}

.file-upload-icon {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 10px;
    display: block;
    animation: bounce 2s ease-in-out infinite;
}

.file-upload-text {
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    color: var(--gray-700);
    margin-bottom: 8px;
    font-weight: 500;
}

.file-upload-hint {
    font-size: 0.85rem;
    color: var(--gray-500);
}

.file-upload-input {
    display: none;
}

.file-selected {
    display: none;
    margin-top: 15px;
    padding: 12px;
    background: var(--light-secondary);
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.file-selected.active {
    display: block;
    animation: slideInRight var(--transition-base);
}

.file-selected-name {
    font-weight: 600;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 8px;
}

.file-selected-name i {
    color: var(--primary);
}

/* ========================================
   Form Groups
   ======================================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
    display: block;
}

.form-label .required {
    color: #ef4444;
    margin-left: 3px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    color: var(--dark);
    background: var(--white);
    transition: all var(--transition-base);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(254, 161, 22, 0.1);
}

.form-input::placeholder {
    color: var(--gray-400);
}

.form-select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-300);
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    color: var(--dark);
    background: var(--white);
    cursor: pointer;
    transition: all var(--transition-base);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23475569'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 40px;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(254, 161, 22, 0.1);
}

.form-hint {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 6px;
    display: block;
}

/* ========================================
   Buttons
   ======================================== */
.btn-tool {
    font-family: 'Nunito', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    padding: 14px 32px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-tool-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-tool-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-tool-primary:active {
    transform: translateY(0);
}

.btn-tool-secondary {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-sm);
}

.btn-tool-secondary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-tool-full {
    width: 100%;
}

.btn-tool i {
    font-size: 1.1rem;
}

/* ========================================
   Submit Section
   ======================================== */
.tool-submit-section {
    text-align: center;
    margin-top: 40px;
    animation: fadeInUp 0.8s ease-out 0.3s;
    animation-fill-mode: both;
}

.tool-submit-btn {
    padding: 18px 50px;
    font-size: 1.1rem;
    box-shadow: var(--shadow-xl);
}

.tool-submit-btn:hover {
    box-shadow: var(--shadow-2xl);
}

/* ========================================
   Feature Highlights
   ======================================== */
.tool-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 50px;
    padding-top: 40px;
    border-top: 2px solid var(--gray-200);
}

.tool-feature-item {
    text-align: center;
    padding: 20px;
    border-radius: 12px;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    animation: fadeInUp 0.8s ease-out;
    animation-fill-mode: both;
}

.tool-feature-item:nth-child(1) {
    animation-delay: 0.4s;
}

.tool-feature-item:nth-child(2) {
    animation-delay: 0.5s;
}

.tool-feature-item:nth-child(3) {
    animation-delay: 0.6s;
}

.tool-feature-item:nth-child(4) {
    animation-delay: 0.7s;
}

.tool-feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.tool-feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
}

.tool-feature-title {
    font-family: 'Nunito', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.tool-feature-desc {
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    color: var(--gray-600);
    line-height: 1.5;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .tool-hero-title {
        font-size: 2rem;
    }

    .tool-hero-subtitle {
        font-size: 1rem;
    }

    .tool-cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .tool-card {
        padding: 25px;
    }

    .tool-features {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .btn-tool {
        padding: 12px 24px;
        font-size: 0.95rem;
    }

    .tool-submit-btn {
        padding: 16px 40px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .tool-landing-container {
        padding: 40px 0;
    }

    .tool-hero-title {
        font-size: 1.75rem;
    }

    .tool-card-title {
        font-size: 1.2rem;
    }

    .file-upload-zone {
        padding: 30px 15px;
    }

    .file-upload-icon {
        font-size: 2.5rem;
    }
}

/* ========================================
   Loading State
   ======================================== */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    border: 3px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

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

.mb-3 {
    margin-bottom: 1rem;
}

.mb-4 {
    margin-bottom: 1.5rem;
}

.mt-4 {
    margin-top: 1.5rem;
}