/* ============================================================
   ROOT VARIABLES
   ============================================================ */

:root {
    --primary_colour_orange: #FF9900;
    --white: white;
    --dark: #131921;
    --light_grey: rgba(185, 184, 184, 0.15);
    --main_font: Arial, Helvetica, sans-serif;
    --darker_orange: #e68a00;
    --darker_white: #F5F5F0;
    --even_darker_white: #F4F5F7; 
    --status_green_dot: #4ADE80;
    --darker_text: #1F2937;
    --darker_grey: #9CA3AF;
    --darker: #111827;
}

/* ============================================================
   HEADER SECTION
   ============================================================ */
html{
    scroll-behavior: smooth;
    max-width: 100%;
    max-height: 100%;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0px;
    color: rgb(17, 17, 19);
    background-color: #eaeded;
    max-width: 100%;
    max-height: 100%;

}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 50px;
}

header {
    background-color: #131921;
}

/* ============================================================
   HERO SECTION
   ============================================================ */

.hero {
    padding: 48px clamp(16px, 6vw, 120px);
    font-family: var(--main_font);
}

/* --- Chat Card --- */

.chat {
    display: flex;
    flex-direction: column;
    max-width: 1000px;
    height: min(640px, 80vh);
    margin: 0 auto;
    background-color: var(--white);
    border-radius: 28px;
    overflow: hidden;              
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
}

/* --- Chat Header --- */

.chat-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 32px;
    background-color: var(--dark);
    color: var(--white);
}

.chat-icon {
    display: grid;
    place-items: center;
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background-color: var(--primary_colour_orange);
    color: var(--dark);
}

.chat-icon svg {
    width: 26px;
    height: 26px;
}

.chat-title h2 {
    font-size: 20px;
}

.chat-title p {
    font-size: 14px;
    color: var(--darker_grey);
}

.chat-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;             
    padding: 8px 16px;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.1);
    font-size: 14px;
    font-weight: 600;
}

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

/* --- Messages Area --- */

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
    flex: 1;                      
    overflow-y: auto;              
    padding: 40px 48px;
    background-color: var(--even_darker_white);
}

.message {
    max-width: 70%;
    padding: 24px 28px;
    border-radius: 24px;
    line-height: 1.6;
}

.message.bot {
    align-self: flex-start;
    background-color: var(--white);
    color: var(--darker_grey);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.message.bot strong {
    display: block;
    margin-bottom: 6px;
    font-size: 18px;
    color: var(--darker);
}

/* for when Faizan adds the chatbot API later */
.message.user {
    align-self: flex-end;
    background-color: var(--primary_colour_orange);
    color: var(--dark);
}

/* --- Suggestion Mini Boxes --- */

.suggestions-label {
    margin-top: 16px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--darker_grey);
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.suggestion {
    padding: 12px 24px;
    border: 1px solid var(--darker_grey);
    border-radius: 999px;
    background-color: var(--white);
    font: inherit;
    font-weight: 600;
    color: var(--darker_text);
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.suggestion:hover {
    border-color: var(--primary_colour_orange);
    background-color: #FFF7EB;
}

/* --- Input Bar --- */

.chat-input {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 32px;
    border-top: 1px solid #E5E7EB;
    background-color: var(--white);
}

.chat-input input {
    flex: 1;
    padding: 18px 28px;
    border: none;
    border-radius: 999px;
    background-color: #F3F4F6;
    font: inherit;
    font-size: 16px;
    outline: none;
}

.chat-input input:focus {
    box-shadow: 0 0 0 2px var(--primary_colour_orange);
}

.send-btn {
    display: grid;
    place-items: center;
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    border: none;
    border-radius: 50%;
    background-color: var(--primary_colour_orange);
    color: var(--darker_text);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.send-btn:hover {
    background-color: var(--darker_orange);
}

.send-btn svg {
    width: 26px;
    height: 26px;
}

/* --- Disclaimer --- */

.chat-disclaimer {
    margin-top: 20px;
    text-align: center;
    font-size: 15px;
    color: var(--dark);
}

/* ============================================================
   FOOTER SECTION
   ============================================================ */



/* ============================================================
   RESPONSE SECTION 
   ============================================================ */


/* ============================================================
   PAST PAPER SEARCH SECTION  (AI feature)
   Uses the same variables and look as the rest of the site.
   ============================================================ */

.papers {
    padding: 0 clamp(16px, 6vw, 120px) 64px;
    font-family: var(--main_font);
}

.papers-card {
    max-width: 1000px;
    margin: 0 auto;
    background-color: var(--white);
    border-radius: 28px;
    padding: 32px clamp(20px, 4vw, 48px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
}

.papers-head h2 {
    font-size: 22px;
    color: var(--darker);
}

.papers-head p {
    margin-top: 8px;
    color: var(--darker_grey);
    font-size: 15px;
}

/* --- Upload / search rows --- */
.papers-upload,
.papers-search {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-top: 24px;
}

.papers-file-label {
    font-weight: 600;
    color: var(--darker_text);
    font-size: 15px;
}

.papers-upload input[type="file"] {
    flex: 1 1 200px;
    font-size: 14px;
}

.papers-search input[type="text"] {
    flex: 1 1 260px;
    padding: 16px 24px;
    border: none;
    border-radius: 999px;
    background-color: #F3F4F6;
    font: inherit;
    font-size: 16px;
    outline: none;
}

.papers-search input[type="text"]:focus {
    box-shadow: 0 0 0 2px var(--primary_colour_orange);
}

.papers-btn {
    padding: 14px 26px;
    border: none;
    border-radius: 999px;
    background-color: var(--primary_colour_orange);
    color: var(--dark);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.papers-btn:hover {
    background-color: var(--darker_orange);
}

.papers-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.papers-msg {
    margin-top: 12px;
    font-size: 14px;
    color: var(--darker_grey);
    min-height: 1.2em;
}

/* --- Uploaded papers list --- */
.papers-list {
    list-style: none;
    margin: 20px 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.papers-empty {
    color: var(--darker_grey);
    font-size: 14px;
}

.papers-item {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 18px;
    border: 1px solid #E5E7EB;
    border-radius: 16px;
}

.papers-name {
    font-weight: 600;
    color: var(--darker_text);
    word-break: break-word;
}

.papers-meta {
    font-size: 13px;
    color: var(--darker_grey);
}

.papers-item-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

.papers-mini {
    padding: 8px 16px;
    border: 1px solid var(--darker_grey);
    border-radius: 999px;
    background-color: var(--white);
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--darker_text);
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.papers-mini:hover {
    border-color: var(--primary_colour_orange);
    background-color: #FFF7EB;
}

/* --- Search answer --- */
.papers-answer {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #E5E7EB;
}

.papers-answer h3 {
    color: var(--darker);
    font-size: 18px;
}

.papers-answer-text {
    margin-top: 8px;
    color: var(--darker_text);
    line-height: 1.6;
    white-space: pre-wrap;
}

.papers-sources-head {
    margin: 20px 0 8px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--darker_grey);
}

.papers-sources {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.papers-source {
    border-left: 3px solid var(--primary_colour_orange);
    background-color: var(--even_darker_white);
    border-radius: 0 12px 12px 0;
    padding: 12px 16px;
    font-size: 14px;
}

.papers-source-doc {
    font-weight: 700;
    color: var(--darker_text);
}

.papers-source-score {
    color: var(--darker_grey);
    font-size: 13px;
}

.papers-source-text {
    margin-top: 6px;
    color: var(--darker_grey);
    line-height: 1.5;
}

/* ============================================================
   SUMMARY POP-UP (modal)
   ============================================================ */

.summary-modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-color: rgba(17, 24, 39, 0.55);
    z-index: 1000;
    font-family: var(--main_font);
}

.summary-modal[hidden] {
  display: none;
}

.summary-box {
    background-color: var(--white);
    border-radius: 24px;
    width: 100%;
    max-width: 640px;
    max-height: 80vh;
    overflow-y: auto;
}

.summary-head {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 28px;
    background-color: var(--dark);
    color: var(--white);
}

.summary-head h3 {
    font-size: 18px;
}

.summary-close {
    background: none;
    border: none;
    color: var(--white);
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
}

.summary-body {
    padding: 24px 28px;
    color: var(--darker_text);
    line-height: 1.6;
    white-space: pre-wrap;
}

/* --- Responsive tweaks for the past-paper section --- */
@media (max-width: 768px) {
    .papers-item-actions {
        margin-left: 0;
        width: 100%;
    }

    .papers-btn {
        width: 100%;
    }
}