/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #0d1117;
    --surface-color: rgba(22, 27, 34, 0.7);
    --border-color: rgba(48, 54, 61, 0.6);
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --positive: #2ea043;
    --positive-bg: rgba(46, 160, 67, 0.15);
    --negative: #f85149;
    --negative-bg: rgba(248, 81, 73, 0.15);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(88, 166, 255, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(46, 160, 67, 0.05), transparent 25%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

/* Typography & Layout */
.app-container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.header-left h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.header-left h1 span {
    color: var(--text-secondary);
    font-weight: 400;
}

.last-updated {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-stats {
    text-align: right;
    margin-right: 1rem;
}

#total-portfolio-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent);
}

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 50%;
}

.status-indicator.active .dot {
    background-color: var(--positive);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(46, 160, 67, 0.4); }
    70% { box-shadow: 0 0 0 6px rgba(46, 160, 67, 0); }
    100% { box-shadow: 0 0 0 0 rgba(46, 160, 67, 0); }
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.primary-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s ease;
    white-space: nowrap;
}

.primary-btn:hover {
    opacity: 0.9;
}

.export-btn {
    padding: 10px 16px;
    background: rgba(88, 166, 255, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
}

.export-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-color: var(--text-secondary);
    color: var(--text-secondary);
}

.settings-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.2s ease;
}

.settings-btn:hover {
    background: var(--surface-color);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* Welcome Grid */
.upload-container {
    display: flex;
    justify-content: center;
    padding: 3rem 0;
}

.welcome-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    width: 100%;
    max-width: 800px;
}

.welcome-card {
    background: var(--surface-color);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    text-align: center;
    transition: all 0.3s ease;
}

.welcome-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.welcome-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.welcome-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.secondary-btn {
    background: rgba(88, 166, 255, 0.1);
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.secondary-btn:hover {
    background: var(--accent);
    color: white;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: #161b22;
    margin: 10% auto;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.close {
    position: absolute;
    right: 1.5rem;
    top: 1rem;
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: var(--text-primary);
}

.settings-form {
    margin-top: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 12px;
    background: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.help-text {
    margin-top: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Table Container */
.table-container {
    background: var(--surface-color);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow-x: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 1rem 1.5rem;
    text-align: left;
    white-space: nowrap;
}

th {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    background: rgba(0,0,0,0.2);
}

td {
    font-size: 0.95rem;
    font-weight: 500;
    border-bottom: 1px solid rgba(48, 54, 61, 0.3);
    transition: background-color 0.3s ease;
}

tr:last-child td {
    border-bottom: none;
}

.text-right {
    text-align: right;
}

.ticker-col { font-weight: 600; color: var(--accent); }
.ticker-col a { color: inherit; text-decoration: none; }
.ticker-col a:hover { text-decoration: underline; opacity: 0.8; }
.name-col { color: var(--text-secondary); }

.price-cell {
    font-variant-numeric: tabular-nums;
    border-radius: 6px;
    padding: 0.25rem 0.5rem;
    display: inline-block;
}

.flash-up { animation: flashGreen 1.5s ease-out; }
.flash-down { animation: flashRed 1.5s ease-out; }

@keyframes flashGreen {
    0% { background-color: var(--positive); color: white; transform: scale(1.05); }
    100% { background-color: transparent; color: inherit; transform: scale(1); }
}

@keyframes flashRed {
    0% { background-color: var(--negative); color: white; transform: scale(1.05); }
    100% { background-color: transparent; color: inherit; transform: scale(1); }
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 300px;
    gap: 1rem;
    color: var(--text-secondary);
}

.spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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